Grade
1

Which One Doesn’t Belong? Notice the Numbers

A. A number rack has 5 red beads on the top and 5 red beads on the bottom. 5+5. B. A number rack has 5 red and 2 white beads on the top. It has 3 red beads on the bottom. C. 6 yellow tally marks and 4 purple tally marks. 6+4. D. A number rack has 5 red and 1 white bead on top. It has 5 red beads on the bottom. 6+5.

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!

Challenge

See if you can 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