Math Riddles

Try These Math Riddles (and visit again in the future to see additional riddles) and be sure to reach the bottom of this page to see my top picks for math riddles out there on the web:

Answer: One of the ‘mothers’ is also a grandmother. Therefore the other mother is both a daughter and a mother to the granddaughter.
In other words, the one mother is both a daughter and a mother.

The digits 0 through 9 all follow the same pattern there is exactly 1 occurrence of each digit for every ten numbers.
For instance the digit 2 appears once between 10 and 19, at 12. And 2 appears once between, 30 and 39 at 32.
However, each of the digits 1 through 9 also appear in other numbers in the tens and hundreds place
Again, let’s look at 2 which appears in 20,21,22, 23, etc.. as well as 200,201, 202,203..
So to figure out how to answer this riddle you had to see what distinguishes the number 1? Only that we are including 1,000 which would be the first ‘1’ in a new series of ten! In other words, the digit 1 only has a single extra occurrence (301 occurrences) compared to 2 or 3 or 9 which each have exactly 300 occurrences.

Answer: Start both hourglasses, then when the six minute hourglass has finished immediately flip it again. When the eight minute hourglass runs out the six minute hourglass has four minutes left, so flip it and it will last another two minutes, so the eight minutes plus two minutes will give you the accurate ten minutes.

Answer: Kevin will win again. In the first race, Kevin ran 100 meters in the same time it took Kyle to run 95 meters. In the rematch, when Kyle is at the 95 meter mark, Kevin will also be there. Since Kevin is faster than Kyle, Kevin wins the race in the final 5 meters.

Answer: (4 X 365) + 1 = 1461. One of the years is a leap year.

Answer: 100 (30 divided by ½ is 60, then add 40 to get 100)

Top Picks for Math Riddles


  • Homeschool Math ( If you can ignore the advertisements for attention deficit medicines that are all over this site (seriously), you’ll find a huge amount of fun and lively math puzzles and problem-solving that will keep your little math genius eager to crank out the solutions for hours on end.
  • ( ): Now here’s a clean site—literally over a thousand riddles, categorized from easy to hard, plus special sections on math, logic, and “what am I” riddles. Very light advertising–no curveball sales pitches or obnoxious pushing of other products on this site.
  • Riddle Ministry ( ) : This site has over 1,300 riddles, with a good portion of them math riddles. But don’t stop at those. They have everything from detective riddles, famous riddles, funny riddles, short riddles, interview riddles and more.
  • Just Riddles and More ( ) : This site boasts over 5,000 riddles, with categories like “illusions,” “fun stuff,” and “jokes.” They have hundreds of math riddles and puzzles to solve.
  • ( ) : This site offers many sub-categories of math riddles, in to such areas as algebra, geometry, numbers & sequences, math brain teasers, and more. Tons of additional quizzes. There is even a section called, “I’m bored,” which ought to wake up anyone from their daily ennui.


Click on one of the topics below to discover the best sites for enlivening your child’s mind: