50 Mathematics Quiz Questions & Answers

Below are 50 mathematics quiz questions with the correct answer and a short explanation for each. Use them to revise, host a quiz night, or prepare for competitions — then challenge yourself with the timed, interactive version on QuizOxa.

Mathematics Quiz Questions and Answers

Q1. 15 × 15 = ?

✅ Answer: 225

💡 15 × 15 = 225. Think: (10+5)² = 100+100+25 = 225.

Q2. √144 = ?

✅ Answer: 12

💡 √144 = 12, because 12 × 12 = 144.

Q3. 25% of 200 = ?

✅ Answer: 50

💡 25% of 200 = 200 × 0.25 = 50.

Q4. 2¹⁰ = ?

✅ Answer: 1024

💡 2¹⁰ = 1,024. Powers of 2 double each time.

Q5. If x + 5 = 12, what is x?

✅ Answer: 7

💡 x = 12 − 5 = 7.

Q6. Area of rectangle 8m × 6m = ?

✅ Answer: 48m²

💡 Area = length × width = 8 × 6 = 48 m².

Q7. What is π (pi) approximately?

✅ Answer: 3.14

💡 π ≈ 3.14159 , the ratio of a circle's circumference to its diameter.

Q8. 1000 ÷ 8 = ?

✅ Answer: 125

💡 1000 ÷ 8 = 125.

Q9. Next prime number after 13?

✅ Answer: 17

💡 17 is prime (only divisible by 1 and 17).

Q10. A triangle has angles 60° and 80°. What is the third angle?

✅ Answer: 40°

💡 Angles in a triangle = 180°. So 180 − 60 − 80 = 40°.

Q11. 12² = ?

✅ Answer: 144

💡 12² = 12 × 12 = 144.

Q12. 50% of 90 = ?

✅ Answer: 45

💡 50% of 90 = 90 ÷ 2 = 45.

Q13. Perimeter of a square with side 7cm?

✅ Answer: 28cm

💡 Perimeter of square = 4 × side = 4 × 7 = 28 cm.

Q14. 99 × 11 = ?

✅ Answer: 1,089

💡 99 × 11 = (100 − 1) × 11 = 1,100 − 11 = 1,089.

Q15. What is 3/4 as a decimal?

✅ Answer: 0.75

💡 3/4 = 3 ÷ 4 = 0.75.

Q16. Area of circle with radius 7cm (π=22/7)?

✅ Answer: 154cm²

💡 Area = πr² = (22/7) × 49 = 154 cm².

Q17. What is LCM of 4 and 6?

✅ Answer: 12

💡 LCM of 4 and 6 = 12.

Q18. Shirt costs $45 with 20% discount. Final price?

✅ Answer: $36

💡 20% of $45 = $9 discount. $45 − $9 = $36.

Q19. What is 2/5 + 1/5?

✅ Answer: 3/5

💡 2/5 + 1/5 = 3/5.

Q20. What is 5! (5 factorial)?

✅ Answer: 120

💡 5! = 5 × 4 × 3 × 2 × 1 = 120.

Q21. What is 40% of 150?

✅ Answer: 60

💡 40% of 150 = 150 × 0.4 = 60.

Q22. Volume of cube with side 4cm?

✅ Answer: 64cm³

💡 Volume of cube = side³ = 4³ = 64 cm³.

Q23. Median of: 3, 7, 1, 9, 5?

✅ Answer: 5

💡 Arrange in order: 1, 3, 5, 7, 9. Middle value = 5.

Q24. How many seconds in one hour?

✅ Answer: 3,600

💡 1 hour = 60 minutes × 60 seconds = 3,600 seconds.

Q25. What is 0.6 as a fraction?

✅ Answer: Both 3/5 and 6/10

💡 0.6 = 6/10 = 3/5 (simplified). Both are correct.

Q26. 3 dozen eggs = how many eggs?

✅ Answer: 36

💡 1 dozen = 12 eggs. 3 dozen = 3 × 12 = 36 eggs.

Q27. Sum of angles in a quadrilateral?

✅ Answer: 360°

💡 The sum of all interior angles in any quadrilateral is always 360°.

Q28. 3² + 4² = ?

✅ Answer: 25

💡 3² + 4² = 9 + 16 = 25.

Q29. Simplify: 18/24

✅ Answer: 3/4

💡 GCD of 18 and 24 is 6. 18/24 = 3/4.

Q30. Car travels 120km in 2 hours. Speed?

✅ Answer: 60 km/h

💡 Speed = Distance ÷ Time = 120 ÷ 2 = 60 km/h.

Q31. √225 = ?

✅ Answer: 15

💡 √225 = 15, because 15 × 15 = 225.

Q32. 7 × 8 = ?

✅ Answer: 56

💡 7 × 8 = 56.

Q33. What is 20% of 500?

✅ Answer: 100

💡 20% of 500 = 500 × 0.20 = 100.

Q34. If 5x = 35, what is x?

✅ Answer: 7

💡 x = 35 ÷ 5 = 7.

Q35. HCF of 12 and 18?

✅ Answer: 6

💡 HCF of 12 and 18 is 6.

Q36. A triangle with all equal sides is called?

✅ Answer: Equilateral

💡 An equilateral triangle has all three sides equal and all angles equal to 60°.

Q37. 1000 × 0.001 = ?

✅ Answer: 1

💡 1000 × 0.001 = 1.

Q38. How many cm in 1 metre?

✅ Answer: 100

💡 1 metre = 100 centimetres.

Q39. 2 + 3 × 4 = ?

✅ Answer: 14

💡 Order of operations: multiply first. 3 × 4 = 12, then 2 + 12 = 14.

Q40. 7/8 as a percentage?

✅ Answer: 87.5%

💡 7/8 = 7 ÷ 8 = 0.875 = 87.5%.

Q41. How many sides does a pentagon have?

✅ Answer: 5

💡 A pentagon has 5 sides. 'Penta' means 5 in Greek.

Q42. 15% of 80 = ?

✅ Answer: 12

💡 15% of 80 = 80 × 0.15 = 12.

Q43. Mean of: 10, 20, 30, 40, 50?

✅ Answer: 30

💡 Mean = Sum ÷ Count = 150 ÷ 5 = 30.

Q44. Circumference of circle with radius 7cm (π=22/7)?

✅ Answer: 44cm

💡 Circumference = 2πr = 2 × (22/7) × 7 = 44 cm.

Q45. What is the reciprocal of 4?

✅ Answer: 0.25

💡 The reciprocal of 4 is 1/4 = 0.25.

Q46. 2³ × 2² = ?

✅ Answer: 2⁵

💡 When multiplying same base: 2³ × 2² = 2^(3+2) = 2⁵ = 32.

Q47. Bag has 3 red, 2 blue, 5 green balls. P(red) = ?

✅ Answer: 3/10

💡 P(red) = 3 ÷ 10 = 3/10.

Q48. 144 ÷ 12 = ?

✅ Answer: 12

💡 144 ÷ 12 = 12.

Q49. Convert 0.125 to a fraction.

✅ Answer: 1/8

💡 0.125 = 125/1000 = 1/8.

Q50. Next number: 2, 4, 8, 16, ?

✅ Answer: 32

💡 This is a geometric sequence (×2 each time). 16 × 2 = 32.

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