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.

Cousin’s Age

If you change the order of the numbers in my cousin’s current age, you’ll get her age for next year but doubled. How old is she?

Riddle Answer

27 Fence Poles

A farmer built a fence around his 17 cows, in a square shaped region. He used 27 fence poles on each side of the square. How many poles did he need altogether?

Riddle Answer

1 Foot Strip

We have a 100 foot piece of ribbon. If it takes one second to cut it into a 1 foot strip how long would it take to cut the entire ribbon into one foot strips?

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

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