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Math class needs a makeover - Dan Meyer — Transcript · YTtoTranscript

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Math class needs a makeover - Dan Meyer

TED-Ed · 2,369 words · 12 min read · EN

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Below is the complete, readable transcript of Math class needs a makeover - Dan Meyer by TED-Ed on YouTube. Read the full text, copy any part you need, or generate a transcript for any video with our free tool.

[Music]

[Music] Can I ask you to um to please recall a time when you really love something, a movie, an album, a song or a book, and you recommended it wholeheartedly uh to someone you also really liked and you anticipated that reaction. you waited for it and it came back and the person hated it. So, by way of introduction,

that is the exact same state in which I spend every working day of the last six years. I teach high school math. Um, I I sell a product to a market that doesn't want it but is forced by law to buy it. I mean, that's kind of it's just a losing proposition. So, there's there's

a useful stereotype about students that I see, a useful stereotype about you all. Um, I could give you guys uh algebra 2 final exam and I I'd expect no higher than a 25% pass rate. And both of these facts say say less about you or my students than they do about what we call

math education in the US today. To start with, I'd like to break math down into two categories. One is computation. This is the stuff you've forgotten. For example, factoring quadratics with leading coefficient greater than one. Okay, this stuff is also really easy to relearn provided that you have a really strong grounding in reasoning, math

reasoning, we'll call it the uh the application of math processes to the world around us. This is hard to teach. This is what we would love students to retain even if they don't go into mathematical fields. This is also something that the way we teach it in the US all but ensures they won't retain

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it. So, I'd like to talk about why that is, why that's such a calamity for society, uh what we can do about it, and to to close with why this is an amazing time to be a math teacher. Okay. So, first five uh five symptoms that you're doing math reasoning wrong in your

classroom. Okay. One is a lack of initiative. Your students don't self-start. Um you finish your lecture block and immediately you have five hands going up asking you to reexplain the entire thing at their desks. Students lack perseverance. Uh they lack retention. and you find yourself reexplaining concepts 3 months later wholesale. There's an aversion to word

problems which describes 99% of my students and then the other 1% are eagerly looking for the formula to apply in that situation. Okay, this is really destructive. David Milts, a creator of Deadwood and other amazing TV shows, has a really good description for this. He swore off creating uh contemporary drama shows set in the present day because he

saw that when people fill their mind with four hours a day of for example Two and a Half Men, no disrespect, it shapes the neural pathways, he said, in such a way that they expect simple problems. He called it an impatience with irresolution. You're impatient with things that don't resolve quickly. You expect sitcomsized problems that wrap up

in 22 minutes, three commercial breaks, and a and a laugh track. And I'll put it to all of you what you already know that no problem we're solving is that simple. Um I'm very concerned about this because I'm going to retire in a world that my students will run. I I'm doing I'm doing

I'm doing bad things to my own future and well-being when I teach this way. I'm here to tell you that the way our textbooks, particularly mass adopted textbooks, teach math reasoning and patient problem solving, it's functionally equivalent to turning on two and a half men and calling it a day. In all seriousness, um here's an

example from a physics textbook. It applies equally to math. Uh notice first of all here that you have exactly three pieces of information there. Each of which will figure into a formula somewhere eventually which the student will then compute. Okay? I believe in real life and and ask yourselves what problem have you solved ever that was

worth solving where you knew all of the given information in advance where you didn't have a surplus of information and you had to filter it out or you didn't have uh insufficient information and had to go find some. I'm sure we all agree that no problem we're solving is like that. And the textbook I think knows how

it's hamstringing students because watch this. This is the practice problem set. When it comes time to the actual problem set, you have problems like this right here where we're just swapping out numbers and tweaking the context a little bit. And if the student still doesn't recognize the stamp this was molded from, it helpfully explains to

you like what what sample problem you can return to to find the formula. Like you could literally, I mean this pass this particular unit without knowing any physics, just knowing how to decode a textbook. That's a shame. So I can diagnose the problem a little more specifically in math. Here's a really cool problem. I like this. It's about

defining steepness and slope using a ski lift. But what you have here is actually four separate layers. And I'm curious which of you can see the four separate layers. And particularly how when they're compressed together and presented to the student all at once, how that creates this impatient problem solving. I'll define them here. You have

the visual. Okay. You also have the mathematical structure talking about grids, measurements, labels, points, axes, that sort of thing. You have substeps which all lead to what we really want to talk about. which section is the steepest? So, I hope you can see I really hope you can see how what we're doing here is taking a compelling

question, a compelling answer, but we're paving a smooth, straight path from one to the other and congratulating our students for how well they can step over the small cracks in the way. That's all we're doing here. So, I want to put to you that if we can separate these in a different way and build them up with

students, uh we can have everything we're looking for in terms of patient problem solving. So right here I start with the visual and I immediately ask the question which section is the steepest and this starts conversation because the visual is created in such a way where you can defend two answers. So we get people arguing against each other

friend versus friend uh in pairs journaling whatever and then eventually we realize it's it's getting annoying to talk about the skier in the lower left hand side of the screen or the the skier just above the midline. And we realize how great would it be if we just had some A, B, C, and D labels to talk about

them more easily. And then and then as we start to define like what what does steepness mean? We realize it'd be nice to have some measurements to really narrow it down specifically what that means. And then and only then we throw down that mathematical structure. The math serves the conversation. The conversation doesn't serve the math. And

at that point, I'll put it to you that nine out of 10 classes are good to go on the whole slope steepness thing. But if you need to, your students can then develop those substeps together. Do you guys see how this right here compared to that? Which one creates that patient problem solving, that math reasoning?

It's been obvious in my practice to me. Uh and I'll yield the floor here for a second to Einstein, who I believe has paid his dues. He talked about the formulation of a problem being so incredibly important. And yet in my practice in the US here, we just give problems to student. We don't involve

them in in the formulation of the problem. So 90% of what I do uh with my five hours of prep time per week is to take fairly compelling elements of problems like this from my textbook and rebuild them in a way that supports math reasoning and patient problem solving. And here's how it works. I like this

question. It's about a water tank. The question is how long will it take you to fill it up? Okay, first things first, we eliminate all the substeps. Students have to develop those. They have to formulate those. And then notice that all the information written on there is stuff you'll need. None of it's a

distractor. So we lose that. Students need to decide all right well does the height matter? Does the side length matter? Does the color of the valve matter? What matters here is such an underrepresented question math curriculum. So now we have a water tank. How long will it take you to fill it up?

And that's it. And because this is the 21st century and we would love to talk about the real world on its own terms, not in terms of line art or clip art that you so often see um in textbooks. We go out and we take a picture of it. So now we have the real deal. How long

will it take it to fill it up? And then even better is we take a video, a video of someone filling it up. And it's filling up slowly, agonizingly slowly. It's tedious. Students are looking at their watches, rolling their eyes, and they're all wondering at some point or another, man, how long is it going to

take to fill up? That's how you know you've baited the hook, right? And and that question off this right here is really fun for me because like I like the intro, I teach I teach kids uh because of my inexperience. I teach the kids that are the most remedial. All right? And I got kids who will not join

a conversation about math because there's like someone else has the formula. Someone else knows how to work the formula better than me. So I won't I won't talk about it. But here every student is on the level playing field of intuition. Like everyone's filled something up with water before. So, I get kids answering the question, how

long will it take? I got kids who are who are mathematically and conversationally intimidated joining the conversation. When you put we put names on the board, attach them to guesses um and kids have bought in here and then we we follow the process I've described. And the best part here or one of the

better parts is that we don't get our answer from the answer key in the back of the teacher's edition. We instead just watch the end of the movie. And that's terrifying. All right? Because the theoretical models that always work out in the answer key, the back of the teachers edition, like like that's great, but it's scary to talk

about sources of error when the theoretical does not match up with the practical. But those conversations have been so valuable, among the most valuable. So, I'm here to report some really fun gains with students who come pre-installed with these viruses day one of the class. Okay, these are kids who who now one semester in I can put

something on the board totally new, totally foreign, and they'll have a conversation about it for three or four minutes more than they would have at the start of the year, which is which is just so fun. We're we're no longer averse to word problems because we've redefined what a word problem is. We're

no longer intimidated by math because we're slowly redefining what math is. This has been a lot of fun. I encourage math teachers I talk to to use multimedia because it brings the real world into your classroom in high resolution and full color to encourage student intuition for that level playing field to ask the shortest question you

possibly can and let those more specific questions come out in conversation to let students build the problem because Einstein said so and to finally in total just be less helpful because uh the textbook is helping you in all the wrong ways. is helping you uh it's buying you out of your obligation for patient

problem solving and math reasoning to be less helpful. And why this is an amazing time to be a math teacher right now is because we have the tools to create this high quality curriculum in our front pocket. It's ubiquitous and fairly cheap. And the tools to distribute it freely under open licenses has also

never been cheaper or more ubiquitous. I put a video series on my blog not so long ago and it got um 6,000 views in uh in two weeks. I get emails still from from teachers in countries I've never visited saying, "Wow, yeah, we had a good conversation about that." Oh, and by the way, here's how I made your stuff

better. Which, wow, I put this problem on my blog recently. You in a grocery store, which which line do you get into? The one that has one cart and 19 items or the line with with four carts and three, five, two, and one items. The linear modeling involved in that was some some good stuff in my classroom,

but it eventually got me on Good Morning America a few weeks later, which is just bizarre, right? And from all of this, I can only conclude that people, not just students, are really hungry for this. Math makes sense of the world. Math is the vocabulary for your own intuition. So, I just really encourage you,

whatever your stake is in education, whether you're a student, parent, teacher, policy maker, whatever, just insist on better math curriculum. Uh we need more patient problem solvers. Thank you.