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  Number & Math Play

Odd One Out
 
Q Which number on this square is the odd one out. Why?

3 33 15 36
12 27 34 18
72 39 30 6
24 21 9 42

 
 
 
A 34.

All the other numbers are evenly divisible by 3.

STRATEGY: Look for a pattern.

Source: Scholastic, Mensa Number Puzzle for Kids, puzzle 141