Math Riddles for Sharp Thinkers
I am a three-digit number. My tens digit is five more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I?
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194.
What two numbers multiply to 36 and add up to 13?
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9 and 4.
A grandfather, two fathers, and two sons went to a movie. How many people were there?
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Three (the grandfather is also a father, and one father is also a son).
If two’s company and three’s a crowd, what are four and five?
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Nine.
I am an odd number. Take away one letter and I become even. What am I?
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Seven.
You buy 3 books for $1.50. How much does one book cost?
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50 cents.
If I have 4 eggs and I break two, cook two, and eat two, how many do I have left?
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Two—you broke, cooked, and ate the same two.
Which weighs more: a pound of feathers or a pound of bricks?
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Neither. They both weigh one pound.
I am a number. Multiply me by 4, divide by 8, and you get me back. What number am I?
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Zero.
What three positive numbers give the same result when multiplied together as when added together?
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1, 2, and 3.
Number Logic and Wordplay
How many times can you subtract 5 from 25?
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Once. After that you are subtracting from 20.
I am an even number. Double me and add six, you get twenty-two. What am I?
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Eight.
A farmer has 17 sheep. All but 9 run away. How many are left?
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Nine.
If you multiply this number by any other number, the answer is always the same. What am I?
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Zero.
I am the only number that has the same number of letters as my value. What am I?
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Four.
What is half of 2 plus 2?
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Three (half of 2 is 1, plus 2 equals 3).
How many sides does a circle have?
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Two—inside and outside.
What comes next in the pattern: 2, 4, 8, 16?
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32.
How can you make the number 6 into an odd number by removing one letter?
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Remove the S from SIX—left with IX (9).
What is the smallest whole number that uses the letter E when spelled out in English?
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One.
Shapes, Time, and Money
If it takes 5 machines 5 minutes to make 5 widgets, how long for 100 machines to make 100 widgets?
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5 minutes.
I am two coins that add up to 30 cents. One is not a nickel. What am I?
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A quarter and a nickel (the other coin is the nickel).
A bat and ball cost $1.10 total. The bat costs $1.00 more than the ball. How much is the ball?
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5 cents.
How many months have 28 days?
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All twelve of them.
I have three sides and three angles. What shape am I?
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A triangle.
I have four equal sides and four right angles. What shape am I?
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A square.
There are 7 sisters. Each sister has 1 brother. How many brothers are in the family?
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One brother.
Divide 30 by half and add 10. What do you get?
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70 (30 ÷ ½ = 60, plus 10).
Where to Use These Math Riddles
They are perfect for:
- Classroom warm-ups
- Puzzle time at home
- Brain teasers in worksheets
- Math game challenges
- Friendly competitions between students or friends
FAQ
What grade level are math riddles for?
Most fit grades 3 through 8. Logic riddles may need a hint for younger students.
Can I use these as a timed challenge?
Yes. Give students 30 seconds per riddle and keep score.
Want more classroom puzzles?
See riddles for the classroom and science riddles.