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Math Riddles for Third Graders Ready to Think

Boost number sense with math riddles for third graders that mix place value, estimation, and playful logic.

🔢 Math time can feel like playtime.

These math riddles for third graders strengthen skills in addition, subtraction, multiplication, and reasoning—perfect for bell work, centers, or homework challenges.


🧮 Third Grade Math Riddles with Answers

I am a three-digit number. My tens digit is 4, my ones digit is 2, and the sum of my digits is 10. What number am I?

I am even, greater than 20, less than 30, and the sum of my digits is 8. What number am I?

If you double me and add 5, the answer is 21. What number am I?

I am the product of 3 and 7. What number am I?

I’m a rectangle with a length of 6 units and width of 4 units. How many squares fit inside me?

You have 18 apples. You share them equally with two friends. How many apples does each get?

I am the difference between 52 and 29. What number am I?

If today is Monday, what day will it be 9 days from now?

I am a number that is a multiple of 5 and 3. I’m between 40 and 50. What am I?

The sum of four consecutive numbers is 46. What is the smallest number?

I am half of 64. What number am I?

I am 9 more than the product of 4 and 6. What number am I?

You roll two dice and add their numbers. What totals can you get?

I have 3 rows of 5 desks. How many desks total?

If a pattern goes 2, 4, 6, 8, what are the next two numbers?


📏 Use these riddles for:

  • Daily warm-up problems
  • Math center rotations
  • Family math nights
  • Tutoring sessions
  • Take-home challenge postcards

Ask students to explain their thinking or create new riddles based on classmates’ names or favorite numbers.

Ready to Test Your Brain?

Challenge yourself with our collection of brain-teasing riddles perfect for all ages!

  • Play fun and tricky riddles
  • Challenge yourself daily with fresh brain teasers
  • Perfect for all ages — kids, teens, and adults