100 Mental Maths Questions & Answers 2026

Quick Addition — 20 Questions

1. 47 + 38 = 85
2. 156 + 247 = 403
3. 999 + 1 = 1,000
4. 72 + 89 = 161
5. 450 + 550 = 1,000
6. 1,234 + 5,678 = 6,912
7. 33 + 67 + 100 = 200
8. 888 + 112 = 1,000
9. 25 + 75 + 50 = 150
10. 499 + 501 = 1,000
11. 17 + 28 + 35 = 80
12. 750 + 250 = 1,000
13. 123 + 456 + 321 = 900
14. 64 + 36 = 100
15. 1,500 + 2,500 = 4,000
16. 85 + 15 + 50 = 150
17. 9,999 + 1 = 10,000
18. 345 + 655 = 1,000
19. 77 + 23 = 100
20. 400 + 600 + 500 = 1,500

Multiplication & Division — 25 Questions

1. 12 × 12 = 144
2. 9 × 9 = 81
3. 15 × 8 = 120
4. 7 × 13 = 91
5. 25 × 4 = 100
6. 11 × 11 = 121
7. 144 ÷ 12 = 12
8. 36 ÷ 6 = 6
9. 100 ÷ 4 = 25
10. 50 × 20 = 1,000
11. 6 × 7 × 2 = 84
12. 1,000 ÷ 8 = 125
13. 17 × 3 = 51
14. 64 ÷ 8 = 8
15. 99 × 9 = 891
16. 24 × 5 = 120
17. 400 ÷ 25 = 16
18. 13 × 7 = 91
19. 225 ÷ 15 = 15
20. 16 × 16 = 256
21. 3 × 3 × 3 × 3 = 81
22. 250 × 4 = 1,000
23. 72 ÷ 9 = 8
24. 18 × 6 = 108
25. 1,200 ÷ 40 = 30

Percentages & Fractions — 25 Questions

1. What is 10% of 350? 35
2. What is 50% of 480? 240
3. What is 25% of 200? 50
4. What is 15% of 60? 9
5. What is 1/4 as a decimal? 0.25
6. What is 3/4 as a percentage? 75%
7. What is 2/5 as a decimal? 0.4
8. What is 5% of 1,000? 50
9. What is 20% of 150? 30
10. What is 1/8 as a decimal? 0.125
11. If an item costs $80 and is 20% off, what do you pay? $64
12. What is 100% of 777? 777
13. What is 1/3 approximately as a decimal? 0.333...
14. What is 12.5% of 800? 100
15. What is 30% of 90? 27
16. If you score 18 out of 20, what percentage is that? 90%
17. What is 7/10 as a percentage? 70%
18. What is 33.3% approximately equal to as a fraction? 1/3
19. What is 40% of 250? 100
20. What is 0.75 as a fraction? 3/4
21. What is 60% of 500? 300
22. What is 5/8 as a decimal? 0.625
23. What is 150% of 200? 300
24. If price increases from $100 to $120, what is the % increase? 20%
25. What is 1/6 approximately as a decimal? 0.1667

Quick-Fire Mixed Math — 30 Questions

1. How many seconds in 5 minutes? 300
2. How many minutes in 3 hours? 180
3. What is the next number: 2, 4, 8, 16, ___? 32
4. What is 7²? 49
5. What is √625? 25
6. How many degrees in a semicircle? 180°
7. What is the sum of 1 to 10? 55
8. What is the sum of 1 to 100? 5,050
9. How many cm in a meter? 100
10. How many mm in a cm? 10
11. What is 1,000 – 369? 631
12. What is 2³? 8
13. What is 2⁸? 256
14. What is the area of a square with side 9? 81
15. What is 3 × 4 × 5? 60
16. What is the perimeter of a 5×8 rectangle? 26
17. How many hours in a week? 168
18. What is 1 million × 1 million? 1 trillion
19. How many degrees in a right angle? 90°
20. What is 999 × 0? 0
21. What is the average of 10, 20, 30? 20
22. What is 7 × 8 - 6? 50
23. How many odd numbers between 1 and 10? 5 (1,3,5,7,9)
24. What comes next: 1, 3, 6, 10, ___? 15 (triangular numbers)
25. What is (5+3) × 2? 16
26. What is 100 ÷ 0.5? 200
27. What is 5! (5 factorial)? 120
28. What is 12² – 11²? 23
29. What is 1,000,000 ÷ 1,000? 1,000
30. What is 0.1 × 0.1? 0.01