Math Arguments
Problems, Questions, and Puzzles to spark discussion and argument in the maths classroom.
Donuts
Imagine going to a donut shop that sells donuts in packs of 5 or 9. The box of nine is shown, and the box of five is four with one in the middle.
You could order 14 by ordering 1 pack of each. If you needed 20, you could order 4 packs of 5.
You could not order 11, or 12.
What is the largest number you could NOT order?
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Source:
David Martin
Happy Tuesday! Imagine going to a donut shop that sells donuts in packs of 5 and 9. You could order 14 by ordering 1 pack of each. If you needed 20, you could order 4 packs of 5. You could not order 11, or 12. What is the largest number you could NOT order?#mathchat #MTBoS
— 𝘋𝘢𝘷𝘦 𝘔𝘢𝘳𝘵𝘪𝘯 (@d_martin05) September 1, 2020
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