Math Riddles with Answers

1892 math riddles with answers and explanations. Easy, medium, hard and expert brain teasers for kids and adults.

• If you divide a number by 12, the remainder is 7. What could the original number be?
• If you add me to myself, I double. What am I?
• If you have 10 candies and share them equally with 2 friends, how many does each person get?
• What is 5 factorial (5!)?
• You have a box containing green and blue marbles. If you take out 3 green marbles, the ratio of blue to green becomes…
• If a runner completes a marathon in 4 hours, how many minutes did he take?
• In a multiplication puzzle, if 6 times a certain number equals 54, what is that number?
• If a triangle has angles of 30 and 60 degrees, what is the measure of the third angle?
• What is the area of a circle with a diameter of 14?
• If a + b = 10 and a - b = 2, what is the value of a?
• In a sequence, the first term is 2, and each term thereafter is double the previous term plus 1. What is the 5th term?
• If I have 10 books and I give away 3, how many do I have left?
• You have 6 apples and you give away 4. How many apples do you have left?
• If you subtract 1/3 from a number, you get 1/4 of that number. What is the number?
• If the circumference of a circle is increased by 50%, what is the percentage increase in the diameter?
• In a 3x3 magic square, the numbers 1 to 9 are arranged so that each row, column, and diagonal sums to the same number.…
• A rectangle's length is three times its width. If the perimeter is 64, what is the area of the rectangle?
• I have a collection of coins. If I have 10 coins and I double their value, I get $2. What is the value of each coin?
• If you add me to my reciprocal, the result is 5. What fraction am I?
• What is the sum of the cubes of the first three prime numbers?
• What digit should replace the question mark in the equation: 1? + 2? = 10?
• What is the next number in the sequence: 2, 4, 8, 16, ...?
• In a certain pattern, 1, 1, 2, 3, 5, ... What is the next number?
• I am a two-digit number. If you reverse my digits and add 27, the result is the original number. What number am I?
• A certain fraction when added to 1/3 gives 1. What is this fraction?
• What fraction becomes a whole number when you subtract 1 from its numerator?
• An hourglass takes 7 minutes to empty completely. If you invert it immediately after it empties, how many total…
• What is 1/2 of 3/4?
• I am a number that is one less than a dozen. What number am I?
• If the product of two numbers is 72 and their difference is 6, what are the numbers?
• In a set of numbers, 2, 3, 5, 7, 11, and 14, which number is the odd one out based on primality?
• Find a number that is both triangular and a perfect square, and is greater than 1.
• What is the smallest odd prime factor of 91?
• What is the value of 4! (four factorial)?
• I am a pair of prime numbers that differ by only two. The sum of my digits is 10. What are my numbers?
• If you take four from nine, what remains in your hands?
• I am a series of numbers: 2, 4, 8, 16... What is the next number in my sequence?
• I am twice as old as my son, and in 20 years I will be 1.5 times his age. How old am I now?
• What number is represented by the following riddle: I am the smallest prime number that is the sum of two other prime…
• You have a bag containing red and blue marbles. If 60% of the marbles are red and you add 6 more blue marbles, the…
• A snail climbs a 10-meter wall at a rate of 3 meters each day but slips back 2 meters each night. How many days will…
• If three times a number, minus 1, equals half the number plus 8, what is the number?
• A train leaves the station every 10 minutes. If the first train leaves at 10:00 AM, what time will the 6th train leave?
• In a locked box, there are 3 red balls, 5 blue balls, and 2 green balls. What is the probability of randomly selecting…
• I am a fraction less than one. If you add me to one half, the result is three quarters. What fraction am I?
• I am an even number. I can be divided by 2 without a remainder. What am I?
• What is the average of all integers from 1 to 100, inclusive?
• I buy a dozen cookies for $3. If I eat half, how much did I spend per cookie?
• What fraction corresponds to the decimal 0.666... that repeats forever?
• What is the solution to the equation: 2(x + 3) = x + 12?

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