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Tad Watanabe

@tadwatanabe

Professor of Math Education at Kennesaw State University, Kennesaw, GA, USA.

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15.11.2024
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Latest posts by Tad Watanabe @tadwatanabe

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(1) If you are teaching Calculus I, out of 10 points, how many points would you give to this student and why?
(2) Is this a reasonable assessment question for Calculus I?

06.10.2025 14:46 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I've been sitting in a Calculus II class where students are learning various integration techniques - u-substitution, integration by parts, trig substitution, partial fraction decomposition, etc. But so much of exercises are really just algebraic manipulation. Is that normal?

02.10.2025 20:00 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

she has been conditioned to reach for a calculator whenever she has to compute.

Maybe this is not a big deal, but it really made me think.

11.09.2025 17:55 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

ability to easily calculate 7^2 + 6 and 55 + 9 did not interfere with her answering the question correctly. But, is that OK? Should she have been able to calculate those without a calculator? She might have been able to calculate them without a calculator if she was asked to do so. It might be that

11.09.2025 17:55 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

I was helping a student in College Algebra. She was working on a problem that asked her to evaluate a composition of functions u and w when x = 7, where u(x) = x^2 + 6 and w(x) = SQRT(x + 9). As she calculated, she used her calculator to calculate 7^2 + 6 and once again 55 + 9. Clearly her lack of

11.09.2025 17:55 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Common Core Possible Revisions 5: Division of Fractions Division of fractions is one of the most challenging topics for upper elementary/early middle school mathematics. It (and multiplication of fractions) is also one of my favorite topics to discuss a…

tadwatanabe.wordpress.com/2025/09/11/c...

11.09.2025 17:48 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Critique The standards for mathematical practice in the Common Core State Standards describes β€œvarieties of expertise that mathematics educators at all levels should seek to develop in their students.…

tadwatanabe.wordpress.com/2025/08/05/c...

05.08.2025 18:52 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Invert-and-Multiply Algorithm for Division of Fractions As I have discussed, in the Common Core State Standards, division of fractions by fractions is a grade 6 standard. Specifically, 6.NS.1 states: Interpret and compute quotients of fractions, and sol…

tadwatanabe.wordpress.com/2025/08/01/i...

01.08.2025 16:57 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Division of Fractions In the previous post, I discussed how the common denominator algorithm for dividing fractions can be derived. In one example, I shared that 7 1/2 Γ· 3/4 can be calculated as follows: 7 1/2 Γ· 3/4 = 1…

tadwatanabe.wordpress.com/2025/07/28/d...

28.07.2025 16:58 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Common Denominator Algorithm for Division of Fractions In a previous post, I mentioned that interpreting division as quotitive leads naturally to a division algorithm often called common denominator algorithm. I have written a post about that algorithm…

Is the common denominator algorithm enough?
tadwatanabe.wordpress.com/2025/07/24/c...

24.07.2025 14:48 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Common Denominator Algorithm for Division of Fractions In a previous post, I mentioned that interpreting division as quotitive leads naturally to a division algorithm often called common denominator algorithm. I have written a post about that algorithm…

I'm on a roll :-)
tadwatanabe.wordpress.com/2025/07/24/c...

24.07.2025 14:45 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Quotitive Division of Decimals (and Fractions) When discussing division of fractions, some mathematics educators suggest that we start with quotitive division problems. So, they may ask students to solve a problem like this: There are 12 pounds…

tadwatanabe.wordpress.com/2025/07/21/q...

21.07.2025 13:47 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Division of Decimals (and Fractions) As I mentioned in my previous post, multiplication and division are typically introduced in equal group situations. Thus, if 3 quantities, A (number of groups), B (group size), and C (total), are i…

tadwatanabe.wordpress.com/2025/07/17/d...

17.07.2025 18:29 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Multiplication and Division of Decimals (and Fractions) I observed 2 Grade 5 lessons that were on division of decimals recently, and they made me think a lot about division. In particular, I was wondering why we teach multiplication and division of deci…

My first blog post in a long while.
tadwatanabe.wordpress.com/2025/07/08/m...

08.07.2025 20:44 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

There is an interesting article, What is a Mathematical Concept?", by Martin Simon in the recent issue of Mathematics Teacher: Learning & Thinking. I wonder what people think about Simon's idea.

30.05.2025 15:59 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

MAT programs for people with undergraduate degrees are often one year (one year plus summer?) programs. Some may be fully online.

28.05.2025 12:42 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I haven't been able to do this in great part because a lot of my connections with Japanese colleagues through that platform. I guess it is not as toxic over there.

13.02.2025 15:03 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

I would love to hear more about it.

13.02.2025 15:00 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

How to make the access to high-quality teacher equitable when we know not all teachers are high-quality (or equally high-quality) may be the second most important job. Should teachers be rotated every N years across different schools?

23.12.2024 20:58 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Although I agree that visual representations may be great support for students' learning, I'm a bit troubled by this image that shows numbers without any unit.

18.12.2024 15:32 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Took me while to register myself, but I think I am now registered.

29.11.2024 12:03 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Is this open to people outside of UK?

28.11.2024 21:44 πŸ‘ 1 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

That’s more than 11,000 steps a day. When I am in the U.S., if I get to 8000, that’s a lot. When I am in Japan, I easily make 10,000 though.

28.11.2024 21:37 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

There is nothing in the β€œold”(?) way that says you can’t work toward the correct answer.

28.11.2024 21:28 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Some are good (?) at making things sound good.

24.11.2024 03:20 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

β€œGradual release of responsibility” is basically I Do We Do You Do, right?

23.11.2024 02:46 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0