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.

10 Years Older than My Sister

I am ten years older than my sister. There was a time when I was three times older than she was, and in one year I will be twice as old as she is. What is my age now?

Riddle Answer

Books on a Bookshelf

There are several books on a bookshelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Riddle Answer

Look and Say

What is the next number in the sequence?
1
11
21
1211
111221
312211
13112221

Riddle Answer

End of the World on a Sunday

If the end of the world should come on the first day of a new century, can you say what are the chances that it will happen on a Sunday?

Riddle Answer

100 Using 4 Sevens

Can you take 4 7’s and arrange them with any math symbols needed to make the total be 100?

Riddle Answer