Grade
5

Which One Doesn't Belong? An Array Away

Look at this set of four pictures. Decide which one doesn’t belong with the other three. Use math words to describe your thinking. There are many ways to think about each one!

A. shows a 35 by 35 array. 900 pieces are yellow, 300 are red, 25 are green. B. shows a 23 by 13 array. 200 pieces are yellow, 108 are red, 9 are green. C. shows a 25 by 12 array. 200 pieces are yellow, 90 are red, 10 are green. D. shows a 25 by 3 array; 60 pieces are red, 15 are green.

Challenge

Find reasons why each of the pictures might not belong with the other three.

Share

Explain your thinking to someone else. Do they have different reasons why one doesn't belong?

Printable Version

Google doc for printing and copying

Reference for Educators

Sample problems and solutions