True, Authentic, Real Life Math Problem of an Eighth Grader

A certain student had recently missed much of the first quarter, so her band teacher did not count those weeks when figuring the credit for the weekly practice logs. Therefore, the student had only five weeks worth of practice log grades for the quarter whereas her classmates had ten weeks worth. She got 100% for each of the first three weeks she was back. When her report card came, she was shocked that she had a C. She thought she had an A in the bag.

Looking back at her practice log grades, she saw 100, 100, 100, 70, 0. “I forgot to turn in last week's practice log,” she explained. BUT, she knew how to figure averages, and when she did, she got 74%. “Ah, so there's the C,” she said.

Then she asked me, “How many minutes will I have to practice to bring my grade back to an A by next week?” True to form, I irritated her by telling her to figure it out. A real life math problem was staring her in the face. She had been wondering if there was such a thing as a real life math problem. “How do I do that?” she wailed. I told her to think about what she already knows and what she needs to know.

Her train of reasoning: One more week means I will have six total weeks of practice log grades. To average 100%, I will need 600 total minutes. I have 370 minutes. So I need 230 more minutes. I will need to practice 230 minutes this week. (An aside: I wonder if my teacher will give credit for so many minutes in one week). My practice log is due on Friday, so I have six days to practice 230 minutes.

So far, so good, but then her reasoning began to go awry. She divided 230 by 60, and got 5.5 on a calculator. She did not question the result. We need to teach students to determine the neighborhood of the result before doing any actual computation. I do not like to call this process “estimation,” because almost all kids have reduced estimation to mere rounding, and nothing more. Most kids tolerate estimation lessons at school, but basically tune them out because they have been socialized to value answer-getting techniques. Estimation does not, in their minds, yield “answers.”

(Now I have to explain that during this whole process, I was busy with my own work, so I was only seeing pieces intermittently, as she showed them to me. She showed me the calculator with the 5.5 in the display, which at this point was all I knew. I reconstructed her train of reasoning later from her comments).

I asked, “What does 5.5 mean?” She said, “5 hours and 50 minutes.” Remember, this student has all As in math, but as I have explained before, much of math in schools is misnamed. It is really non-math, but since schools call it math, students believe it is math, and if they get good grades in non-math, they believe they are good at math.

I probed, “How did you get that?” She looked at me like, well duh, isn't it obvious and said a little too loudly, “5.5 is 5 hours and 50 minutes.” Then turning away, she poked something into her calculator.

“How do I round this?” she asked. The display showed 0.9166666.

“You have asked the question wrong. No one can answer your question the way you asked it. You need to specify what place you want to round it to.”

“The thousandth's place. So 0.917.”

“That's right. But what are you counting?”

She pondered a moment and wrote 0.92.

“And what is that?” “Minutes,” she said, and wrote 92.

“How did you get that?”

“I need minutes, so I moved the decimal point.”

“'I moved the decimal point' is never a mathematical explanation for anything. You need to give a mathematical reason for the math you do. What did you do to get 0.92 in the first place?”

“I divided 5.5 by 6 to get the number of minutes I need to practice everyday. 0.92 minutes doesn't make sense so I need to move the decimal to get a number that makes sense.” (With this kind of reasoning, is it any wonder our students are so poor at math? And if they use the same faulty reasoning for any of life's other problems, no wonder decision-making ability is also poor. When they become adults, they are easily scammed by poor reasoning that sounds good to them).

She has three main problems:

1. Using disembodied numbers

Teachers have allowed her and her classmates to disembody numbers since first grade. What I mean is students have been trained to compute with only the numbers and attach the units to the result later. When students do that, they attach the unit they want, not the unit their computation produces. What she should have done is written 5.5 hours = 0.92 hours/day. Her unit was “hours/day.” However, since she was looking for minutes, she did the math the way so many students (and adults) do: 5.5/6 = 0.92 minutes.

2. Mixing bases

She did not realize that decimals numbers are base 10, and clock numbers are NOT base 10. I set up some place value columns for decimal numbers, and another set of columns for clock numbers. Then we did some counting so that she could see how numbers end up in the columns they do. First, we counted decimally, that is, in base ten. Then we counted time. As our paper time clock ticked over 59 in the minutes column to 1 in the hour column and 0 in the minutes column, she exclaimed, “Oh, base 60, like the Incas.” She could tell me that 0.5 = 50/100 = 50%, but still insisted that 5.5 hours = 5 hours and 50 minutes. She realized that she was looking for 50% of 60 minutes, but insisted she should divide 50% by 60. Eventually, understanding dawned. She realized that since 50% means half, then half of an hour is 30 minutes, so 5.5 hours means 5 hours 30 minutes. (My own work had come to a complete standstill long before). “So 'of' means multiply, right?”

3. Misunderstanding “Decimal Number”

She thinks, like so many kids do, that a decimal number is a number with a decimal point. Just take out the decimal point and presto, changeo, it is not a decimal number anymore. What else do we expect when we teach kids tricks,shortcuts and blind procedures,and call this strange conglomerate "math?"

In quite East Asian style, we had spent over an hour on this one problem. Eventually, she determined that (leaving aside the original calculator error), she actually had gotten her answer way back at 0.92 hours/day. She realized that the math had “spoken” to her if she had only thought about it correctly. What the math said was that she would need to practice a little less than an hour a day. She never noticed the calculator error, and I did not point it out.

Epilogue:

She practiced 60 minutes (in 30 minute increments) three days in a row. Then it occurred to her that if she practiced 60 minutes per day for 6 days, her total would be 360 minutes, not the 240 minutes she was expecting. She has not practiced for two days, but plans to practice 60 minutes on the sixth day. She got a real-life lesson in checking the math by plugging the solution back into the original problem, a step her teacher requires, but she resents as a time waster. We talked about that maybe her teacher really does have some wisdom in her requirements. She also admitted that her goal is to do the minimum necessary to secure an A. Excellence and doing one's best is just adult yadayada. At least her bar is set at A.

Tricks and Shortcuts vs. Mathematics

The issue is not whether algebra should be taught in the eighth grade or later. The issue is not whether local schools should be able to make their own textbook adoption decisions. The issue is about how easily states make big changes based on flimsy research which asks the wrong questions, only to backtrack later because solutions that solve the wrong problem do not work. California reverted to phonics in 1995 after abandoning it for a faulty implementation of whole language based on research that answered some questions, but not the questions that matter.

The emphasis on algebra in the eighth grade is misplaced when even students with good math grades enter algebra weak in math concepts. I am working with an A student now who is solving for x in problems involving mixed numbers. She wrote these "computations:" 2 + ¼ = 2¼, 3 + (- ¾) = 3-¾, and -2 + ½ = -2½. Do you see the pattern? In her mind, numbers are disembodied entities with no real meaning. She thinks all she has to do is take out the plus sign and push the fraction up against the whole number.

These silly errors happen in an education system where children have been taught tricks and shortcuts since first grade. The problem is teachers call tricks and shortcuts "math," and when children do well on a test of tricks and shortcuts, they learn their good grade is proof they understand math. Actually the grade proves only that they can reliably implement tricks and shortcuts.

I have worked with children who have terrible math anxiety because they do not do well with the tricks and shortcuts. Some part of their mind has rejected the tricks and shortcuts as not making sense, so "math" does not make sense. If they ever get a chance to acquire true number sense, then they find out they are good at math after all.

Sometimes we reward unthinking compliance (as when kids memorize the tricks and shortcuts) and punish the thinkers for whom the tricks and shortcuts do not make mathematical sense.

American Education is NOT Failing....

...In fact, it accomplishes its hidden curriculum perfectly, according to Danjo1987, who hits several out of the park his first day up to bat on EdWeek forums. hllnwlz wound up the pitch and effectively makes many of the same points.

If you have been following this blog, you know that last year I am the "parent" (from the school's point of view) for a particular child who is now an eighth grader. My kids are grown; still it has been instructive to observe her schoolwork and communicate with a school as a savvy teacher/parent. I have been reminded once again that schools really do not like interacting with savvy parents. When schools say they want parent involvement, what they usually mean is they want parents to bake cupcakes once in a while and make sure the student does the homework everyday. More than that, and you are stigmatized as a "helicopter parent."

Overall, the girl's teachers seem to be competent;a couple strike me as excellent. There is one teacher I simply cannot fathom. On the midterm progress report, this teacher gave this straight-A student a citizenship grade of "N" for "excessive absences" during a medical leave. Upon her return to class, she took a "diagnostic" test and got a "D." This is the student's only grade for the class, and the grade teacher put on the progress report. (The other teachers gave her "I" for incomplete).

For the past five weeks, apparently this teacher has done nothing gradable in class. At the close of the term last Friday, there was only one grade in the online system the school uses: that "D." The student's grade on the report card? C-. I am about to intervene.

Meanwhile, in her other classes, she often brings home homework that astound me with the easiness and triviality of it. I see the kind of homework I used to get as a second or third grader. For example, she has to write a little essay about a short story they read in English class. The first assignment is to analyze the writing prompt, write down the verbs that tell what the student is to do, etc. In eighth grade? And the requirements for the regular notebook checks are beyond ridiculous, but the school feels if they do not force the students to organize, none of them will. Apparently, they did not learn how to collect and organize their work in elementary school. The only reason she writes both her first and last name on papers is because I insisted she write a complete heading on each paper whether the teacher required it or not. "But I am the only one with my name," she complained. Does not matter.

What I see is a disjointed and inconsistent system characterized by low expectations, even as the adults give inordinate emphasis to test scores.

Wrong Questions About Spreadsheet Math

Spreadsheets are a ubiquitous and necessary tool these days. Students need to learn spreadsheet math.

"Our children still spend hundreds of hours perfecting their ability to add, subtract, multiply, and divide fractions. And the pinnacle of math for most of our K-12 students remains the ability to solve quadratic equations. When was the last time you used any of these skills? When did you last multiply two three-digit numbers together on paper, add two improper fractions with unlike denominators, or solve a quadratic equation?"

These are the questions people asked when it came to calculator use, and they are still the wrong questions. Spreadsheet math will not replace the ability to actually understand math any more than calculators did.

When the National Council of Teachers of Mathematics (NCTM) recommended calculators for even the youngest students, they rhapsodized about about how calculators would revolutionize math teaching, using the same sort of language that idealizes the potential of spreadsheet math.

"By teaching our children spreadsheet math we enable them to solve ...fascinating problems, problems without a single right answer, problems that can be explored, problems that get our children thinking "out of the box."

And that was exactly the wrong-headed pie-in-the-sky rationale for recommending calculators. It sounds great but does not work in practice. The problem with math instruction is not whether we should be using calculators or spreadsheets. The problem is the lack of skilled math teachers. The problem is the continued reliance on teaching tricks and shortcuts instead of math. Like calculators, spreadsheets have a similar tendency to replace thinking.

Beginning in 2001, I researched the calculator fallacy extensively culminating in a 78-page report in 2010. Briefly, I found that the research NCTM insisted supported the use of calculator in the early grades did not exist.

I agree that students need to learn spreadsheets, but not as a substitute for learning math. Since our elementary teachers lack an ability to teach math for understanding, abundant experience with mechanical processes, though far from ideal, is pretty much the only way kids learn to tell an unreasonable answer from a reasonable one, and even then they are not very good at it.

Just last week, a friend's eighth grade daughter (A+ in math per last progress report) was sure that if $27.50 could buy 10 lbs of hamburger, then $55.00 would buy over 150 lbs because "I followed all the steps correctly." When I told her that obviously she had not, she argued that even the calculator agreed with her, so I must be the wrong one. Just yesterday she insisted that -3 + ½ = -3½ (by analogy to 2 + ½ = 2½). In her mind, all you have to do is get rid of the plus sign and shove the fraction up against the whole number. When these kinds of misconceptions plague even good students, no wonder students who are not as “good” have math anxiety. Deep down, the anxiety is related to an unspoken and unspeakable suspicion that math makes no sense. They are right. When math is turned into a system of tricks and shortcuts, it makes no sense.

Surprise! Kids Value Rote Learning...

Surprise! Kids Value Rote Learning...

...just not when they are the one expected to memorize knowledge. Have you ever had a child ask you a question that require a memorized fact to answer? It happened to me recently. We were listening to a CD of classical music that had no printed table of contents. With nearly every piece, the (junior high) child asked, “Who wrote that?” Luckily, I can google the answer. She became exasperated with my lack of certainty and my need to look up so many of the composers. She asked impatiently, “Didn't you have to study music history when you were in school?”

Me: Yes, I did.

Her: Then how come you don't know who wrote all these songs?

Me: Do you like history class?

Her: NO, I hate it.

Me: Why?

Her: Because we have to memorize so many dates and other trivia.

Me: I guess you will start applying more gusto to your memorization.

Her: Why would I do that?

Me: Because clearly you think that memorizing facts is an important part of your education.

Her: Nooo. Whatever gave you that idea?

Me: Because you think it was an important part of my education.

Her: I never said that!

Me: But you clearly expect me to remember music composers off the top of my head better than I do. How would I have learned that information in the first place, except by memorizing it as facts? And you expect me to still remember it? Don't you think you should hold yourself to the same expectation?

Her: Well, of course.

Me: So I guess you won't groan anymore when teachers expect you to memorize stuff.

Her: Who said I minded memorizing stuff?

Me: Whatever.

Her: Hey, that's my line.

In Case of Nothing to Do, Break Glass...

...and then sweep up broken glass.

Americans have hopes and ideals for public education. As David Sirota explains,

Here in the industrialized world’s most economically unequal nation, public education is still held up as the great equalizer — if not of outcome, then of opportunity. Schools are expected to be machines that overcome poverty, low wages, urban decay and budget cuts while somehow singlehandedly leveling the playing field for the next generation. And if they don’t fully level the playing field, they are at least supposed to act as a counter-force against both racial and economic inequality.

The American ideal is that public education is supposed to be not only the engine of the American Dream, but also the primary mechanism for overcoming the social-economic obstacles of birth. Meanwhile, public educators consistently cite the poverty of their students as the number one reason public education fails to perform its promise. So, public education is supposed to give poor students the tools they need to overcome poverty, but public education cannot give them these tools because the students are poor. Teachers say education reform proposals that fail to address poverty are doomed to fail. We are trapped in a vicious circle. In such an environment, no wonder policy-makers, most of whom lack education experience, feel pressured to do something---anything. Education policies thus tend to be a perpetual cycle of creating and cleaning up messes.

And no wonder. Policy makers lack expertise themselves, so they turn to advice from those who seem to have proper credentials. Who do they ask? Education professors. Sounds reasonable, but guess what? Many education professors lack significant in-the-trenches experience in the very places teachers must implement policies handed down from on high. American society does not trust teachers. The main reason for the lack of trust is the double-mindedness of society. Sometimes we consider teachers to be professionals, and then undermine their professional judgment when we consider them hired laborers subject to dismissal for insubordination. We steadfastly refuse to put teachers at the head of the policy table even though, as Nancy Flanagan puts it, the teachers know where the carts are.

If we want to invest in a highly skilled teaching force, perhaps it's time to stop positioning teachers as drop-in observers who should be grateful for the chance to "represent" their peers in important decision-making bodies...Teachers should be at the head of the table, calling the meeting. The more professional responsibilities we take off teachers' plates, to standardize and homogenize, the more teachers' professional judgment is weakened.

Teachers should not be the target of reform, but the drivers. Right now, teachers are lucky if they can stand outside the door and listen at the keyhole.

At the start of the Obama presidency, when the Department of Education had lots of openings, the administration solicited applications. Many teachers applied. It turned that the administration was only interested in perpetuating more of the same, not ushering the change we all hoped for. Any PhD, especially a well-published PhD, whether they have actual significant experience or not, trumped highly effective, veteran teachers every time. Perhaps the number one disappointment educators have with the Obama administration is the refusal to listen to real teachers. They do not listen because they do not trust. They do not trust because our present policies prevent recruitment from among the most academically able students.

Teaching is not a top job choice, but a last resort. I routinely ask my education students why they want to be teachers. The answers are underwhelming. My top two favorite answers because they indicate the status of teachers in America: “I flunked out of hotel management,” and “It is either teaching or the Army.” In such an environment, it is difficult for the American public to accord teachers the respect and esteem they enjoy in other countries. Meanwhile, administrators break the glass and expect teachers to clean up the mess.

Smart People (You and Me) are Stupid

A recent provocative article from the New Yorker begins:

Here’s a simple arithmetic question: A bat and ball cost a dollar and ten cents. The bat costs a dollar more than the ball. How much does the ball cost? The vast majority of people respond quickly and confidently, insisting the ball costs ten cents. This answer is both obvious and wrong. (The correct answer is five cents for the ball and a dollar and five cents for the bat.)

Or try this one:

West and his colleagues began by giving four hundred and eighty-two undergraduates a questionnaire featuring a variety of classic bias problems. Here’s a example: In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake? Your first response is probably to take a shortcut, and to divide the final answer by half. That leads you to twenty-four days. But that’s wrong. The correct solution is forty-seven days.

Our first mistake is to assume the human beings are rational. We should start from the premise that human beings are lazy (Yes, I am talking about you, and I am talking about me).

When people face an uncertain situation, they don’t carefully evaluate the information or look up relevant statistics. Instead, their decisions depend on a long list of mental shortcuts, which often lead them to make foolish decisions. These shortcuts aren’t a faster way of doing the math; they’re a way of skipping the math altogether. Asked about the bat and the ball, we forget our arithmetic lessons and instead default to the answer that requires the least mental effort.

My son calls it the “slacker syndrome.” The first step to learning to make good decisions is to humbly acknowledge that deep down we are all slackers. The smarter we are, the more stupidly we decide, like the super-smart guy who thinks everyone else is an idiot, but HE can time the stock market.

...smarter people are more vulnerable to these thinking errors...intelligence seems to make things worse. The scientists gave the students four measures of “cognitive sophistication.” As they report in the paper, all four of the measures showed positive correlations, “indicating that more cognitively sophisticated participants showed larger bias blind spots.”....

Okay, now that I know I am prone to this weakness (maybe the next time a job interviewer asks me about my number one weakness, I should admit that I am stupid....hmmm...maybe not), I can use this new-found self awareness to avoid it in the future. Think again.

...“people who were aware of their own biases were not better able to overcome them.”...

Even worse, we all tend to think of ourselves more highly than we ought.

Perhaps our most dangerous bias is that we naturally assume that everyone else is more susceptible to thinking errors, a tendency known as the “bias blind spot.” This “meta-bias” is rooted in our ability to spot systematic mistakes in the decisions of others—we excel at noticing the flaws of friends—and inability to spot those same mistakes in ourselves.

Wow, that sounds like a modern version of old advise from Jesus.

"Why do you look at the speck of sawdust in your brother's eye and pay no attention to the plank in your own eye?” (Matthew 7:4)

Education and self-awareness do not work because the meta-cognition is not available.

The problem with this introspective approach is that the driving forces behind biases—the root causes of our irrationality—are largely unconscious, which means they remain invisible to self-analysis and impermeable to intelligence.

Therefore we are doomed to live in a Zen paradox.

The more we attempt to know ourselves, the less we actually understand.

Nevertheless, I cannot help but feel education and self-awareness of our biases must be better than ignorance. At least, we can learn to be more tolerant and forgiving of others.