Math Brain Teasers #1 – 10 Quick Logic Puzzles (With Answers)

Math Brain Teasers #1 – 10 Quick Logic Puzzles

Sharpen your mind with these 10 fun and tricky math puzzles! 🧠 Try solving each one before clicking “Show answer.” No calculator needed — just logic and focus!

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1. A number is doubled and then 6 is added to get 20. What is the number?
   Show answer

   7 (2x + 6 = 20 → x = 7)

2. Fill in the blank: 2, 6, 12, 20, 30, ___
   Show answer

   42 (Differences are +4, +6, +8, +10, +12)

3. If 5 pencils cost $1.00, how many pencils can you buy for $3.00?
   Show answer

   15 pencils

4. Which is larger: 3/4 or 4/5?
   Show answer

   4/5 (0.75 vs 0.8)

5. What two numbers multiply to 36 and add up to 13?
   Show answer

   9 and 4

6. Continue the pattern: 1, 1, 2, 3, 5, 8, ___
   Show answer

   13 (Fibonacci sequence)

7. If a shirt priced at $80 is discounted by 25%, what’s the final price?
   Show answer

   $60 (25% of 80 = 20 → 80 - 20 = 60)

8. What is 15% of 200?
   Show answer

   30

9. Sequence: 3, 9, 27, ___
   Show answer

   81 (×3 each step)

10. If x + x/2 = 12, what is x?
    Show answer

    8 (1.5x = 12 → x = 8)

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🧠 Did You Solve Them All?

These puzzles test your ability to spot patterns and think logically. If you got 7 or more right — you’re sharper than most!

Try next: General Knowledge Quiz · Science Facts · English Word Quiz