Grade
4

Which One Doesn't Belong? Triangles

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

A. shows a triangle with 30 in the top, 5 and 6 in the lower corners. B. shows a triangle with an unknown in the top, 6 and 6 in the lower corners. C. shows a triangle with an unknown in the top, 4 and 8 in the lower corners. D. shows a triangle with 24 in the top, an unknown and 6 in the lower corners.

Challenge

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

Share

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

Printable Version

Google doc for printing and copying

Reference for Educators

Sample problems and solutions