Math Arguments

Problems, Questions, and Puzzles to spark discussion and argument in the maths classroom.

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Two Digits

List all two digit numbers that are divisible by the sum of their digits. Observations?

Why isn't 99 such a number?

Could the number have two odd digits?

What other mathematical aspects of this caught your attention? What do you wonder about the situation?

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Notice, Wonder
David Marain
MS Math

Source: David Marain

(For grades 4-??)
List all two digit numbers that are divisible by the sum of their digits. Observations? Why isn't 99 such a number? Could the number have two odd digits?#MTBoS @HarMath @johnjoy1966 @jamestanton @benjamin_leis @iteachmathAll #Math
— David Marain (@dmarain) September 17, 2020

More Information:
Noticing and wondering is a tool to help students:
- Understand the story, the quantities, and the relationships in the problem.
- Understand what the problem is asking and what the answer will look like. Have some ideas to begin to solve the problem.
More Here at NCTM