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 he/she belongs with the other three by wearing a disguise. 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.