The Lineup: Who doesn’t Belong and Why?

In each problem below you will find a group of four numbers or expressions. Three of the numbers belong to the same family. The other number is trying to fool you into thinking that it belongs with the other three. Pick out the number or expression and explain why that number doesn’t belong to the family?

Problem 1:


Circle the number that doesn’t belong to the family and explain why.

Problem 2:


Circle the number that doesn’t belong to the family and explain why.

Problem 3:


* means multiplication
Circle the number that doesn’t belong to the family and explain why.

Problem 4:


Circle the number that doesn’t belong to the family and explain why.