Welcome to our collection of Hard Math Riddles for Kids! These brain-busting puzzles are designed for children aged 6-14, offering challenges that boost problem-solving skills and enhance mathematical thinking. Whether you’re looking for tricky riddles in multiplication, geometry, or fractions, we’ve got the perfect set of riddles to make learning fun!
Hard Math Riddles for Kids Aged 6-8
1. What is 12 – 7 + 5?Click to see the answer
102. If you have 5 dimes and 2 nickels, how much money do you have?
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60 cents3. What number is 3 more than twice 4?
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114. If a rectangle has a length of 8 cm and a width of 4 cm, what is its area?
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32 cm²5. What is 20 divided by 4?
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56. A triangle has sides of 3 cm, 4 cm, and 5 cm. What kind of triangle is this?
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Right triangle7. If you subtract 2 from 15, then divide the result by 3, what do you get?
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13/3 ≈ 4.338. What is 3 multiplied by 7?
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219. If you cut a pie into 6 slices and eat 2, what fraction of the pie is left?
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4/6 or 2/310. I am an odd number. When you add 3 to me, I become an even number. What number am I?
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511. What is the product of 8 and 2?
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1612. If you take 3 away from 9 and then multiply by 2, what is the result?
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1213. If you have 18 cookies and give 6 to your friends, how many do you have left?
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12 cookies14. What is 7 times 3?
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2115. How many sides does an octagon have?
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816. If you have 5 dollars and spend 2, how much money do you have left?
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3 dollars17. What is 100 divided by 10?
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1018. If you add 15 to 5 and then subtract 7, what is the result?
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1319. What is 3 more than 20 divided by 5?
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720. What number comes between 29 and 31?
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3021. How many faces does a cube have?
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6 faces22. What is 8 divided by 4?
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223. A rectangle has a perimeter of 24 cm. If its length is 8 cm, what is its width?
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4 cm24. What is the smallest even number?
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225. What is 5 + 5 + 5?
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15Summary: These hard-level math riddles for kids aged 6-8 challenge basic problem-solving skills and introduce concepts like multiplication, division, and fractions.
Hard Math Riddles for Kids Aged 8-10
1. If you multiply me by 5 and subtract 10, the result is 25. What number am I?Click to see the answer
72. What is the square root of 36?
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63. A rectangle has an area of 48 square cm and a width of 6 cm. What is its length?
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8 cm4. I am an even number. When divided by 4, I give 4 as a result. What number am I?
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165. What is the least common multiple of 4 and 6?
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126. If you have 100 candies and give 25% to your friend, how many do you give away?
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25 candies7. What is the result of 9 + 9 divided by 3?
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128. A pizza is cut into 12 equal slices. If you eat 5, how many are left?
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7 slices9. What is 15% of 60?
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910. I am a number. When multiplied by 7, I give 49. What number am I?
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711. If you divide 100 by 5, what is the result?
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2012. What is the product of 6 and 8?
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4813. If you have $45 and spend $30, how much do you have left?
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$1514. What is 25% of 200?
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5015. A triangle has two sides of equal length and one different side. What kind of triangle is it?
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Isosceles triangle16. What is 12 times 12?
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14417. If you multiply me by 4 and subtract 8, you get 20. What number am I?
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718. A rectangle has a length of 7 cm and a width of 5 cm. What is its perimeter?
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24 cm19. What is 10% of 500?
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5020. What is the next number in the sequence: 1, 3, 6, 10, 15, __?
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2121. If you have 4 apples and you give 2 to your friend, what fraction of your apples do you have left?
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2/4 or 1/222. What is the least common multiple of 5 and 10?
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1023. If you have 4 quarters, how much money do you have?
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$1.0024. If you divide 80 by 8, what is the result?
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1025. What is 9 times 7?
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63Summary: These hard-level math riddles for kids aged 8-10 will challenge multiplication, division, percentages, and fractions while building stronger problem-solving skills.
Hard Math Riddles for Kids Aged 10-12
1. If you multiply me by 5 and subtract 25, the result is 50. What number am I?Click to see the answer
152. What is the square root of 81?
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93. A rectangle has a length of 10 cm and a width of 5 cm. What is its perimeter?
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30 cm4. If you subtract 18 from 100, then divide the result by 4, what do you get?
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20.55. A circle has a diameter of 10 cm. What is its radius?
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5 cm6. What is 25% of 400?
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1007. If you have $100 and you spend 30% of it, how much money do you have left?
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$708. What is the least common multiple of 6 and 8?
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249. A triangle has sides of 6 cm, 8 cm, and 10 cm. Is this a right triangle?
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Yes10. If 45% of a number is 90, what is the number?
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20011. What is 6 squared plus 2 cubed?
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4012. What is the least common multiple of 5, 10, and 15?
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3013. If you have 144 candies and divide them equally among 12 friends, how many candies does each friend get?
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12 candies14. If you subtract 25 from 100, then divide the result by 5, what do you get?
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1515. What is the product of 11 and 12?
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13216. A square has an area of 49 square cm. What is the length of one side?
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7 cm17. If you multiply a number by 4 and add 5, the result is 29. What is the number?
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618. If you have $120 and spend 40%, how much money do you spend?
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$4819. What is 25% of 200?
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5020. If you have 16 apples and give away half, how many apples do you have left?
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8 apples21. A triangle has an angle of 90 degrees. What kind of triangle is this?
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Right triangle22. What is the perimeter of a square with sides of 8 cm?
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32 cm23. What is 75% of 400?
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30024. If you subtract 45 from 90, what is the result?
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4525. What is the sum of 18 and 36?
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54Summary: These hard-level math riddles for kids aged 10-12 test knowledge of multiplication, division, geometry, and percentages with challenging puzzles.
Hard Math Riddles for Kids Aged 12-14
1. If you multiply me by 3 and subtract 10, the result is 20. What number am I?Click to see the answer
102. What is the cube root of 125?
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53. A circle has a radius of 7 cm. What is its area (use π ≈ 3.14)?
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Approximately 153.86 cm²4. If you divide 120 by 4 and then subtract 15, what is the result?
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155. A triangle has angles of 30°, 60°, and 90°. What kind of triangle is this?
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Right triangle6. What is 20% of 150?
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307. If you have $200 and spend 35%, how much money do you spend?
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$708. What is the least common multiple of 12 and 15?
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609. If you have 5 pens and buy 7 more, then give 4 away, how many pens do you have?
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8 pens10. What is 12 squared?
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14411. A rectangle has a perimeter of 64 cm. If its width is 10 cm, what is its length?
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22 cm12. What is the cube of 4?
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6413. If you multiply a number by 8 and the result is 64, what is the number?
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814. What is 35% of 200?
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7015. A triangle has two sides of 8 cm and 10 cm. What is the perimeter if the third side is 12 cm?
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30 cm16. What is the greatest common divisor (GCD) of 36 and 60?
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1217. If you have $50 and spend 40%, how much do you have left?
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$3018. What is 9 cubed?
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72919. A pizza is cut into 8 slices. If you eat 5, what fraction of the pizza is left?
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3/820. What is the square root of 144?
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1221. What is the volume of a cube with side length 5 cm?
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125 cm³22. If a car travels 60 miles in 1 hour, how far does it travel in 3.5 hours?
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210 miles23. A rectangle has a width of 12 cm and a length of 8 cm. What is its area?
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96 cm²24. What is 5% of 300?
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1525. If you subtract 64 from 100, what is the result?
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36Summary: These hard-level math riddles for kids aged 12-14 test advanced math concepts like percentages, geometry, cubes, and problem-solving with challenging questions.
We hope you enjoyed solving these Hard Math Riddles for Kids! These challenging questions not only test math skills but also make learning exciting and engaging. Keep practicing, and stay tuned for more brain-teasing riddles to sharpen your mind!
You can click the link to solve the Easy Math Riddles for Kids and Medium Math Riddles for Kids.
