Math Riddles

These Math Riddles are based on math concepts and can be solved with a bit of math and logic. These fun riddles can surely give you a tough time.

Jar Half Full of Bacteria

The number of bacteria in a large sealed jar doubles every minute. The bacteria will take an hour to fill the jar. When will the jar be half full?

Riddle Answer

20 Eyes

A book slipped from a man’s hands and fell on the floor with a loud noise. 20 eyes looked at him.

How many people were in the library?

Riddle Answer

Tina’s Age

Mark is 6 years old. His sister Tina is half of his age. So when Mark is 100 years old, how old is Tina?

Riddle Answer

Twenty Coins

Twenty men, women and children earn twenty coins between them. Each man earns 3 coins, each woman 1.5 coins and each child 0.5 coin. How many men, women and children are there?

Riddle Answer

Susie’s Birthday

The day before yesterday Susie was 17. Next year, she will be 20. How can this be?

Riddle Answer