Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 95 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.540 increased by 10% =
2. 2.275 decreased by 12% =
3. 3.532 increased by 75% =
4. 4.750 increased by 10% =
5. 5.360 decreased by 5% =
6. 6.425 decreased by 40% =
7. 7.105 decreased by 40% =
8. 8.580 increased by 35% =
9. 9.594 increased by 50% =
10. 10.300 increased by 10% =
11. 11.560 increased by 15% =
12. 12.100 increased by 8% =
13. 13.550 increased by 12% =
14. 14.240 increased by 15% =
15. 15.628 increased by 75% =
16. 16.380 decreased by 15% =
17. 17.75 decreased by 60% =
18. 18.270 decreased by 10% =
19. 19.765 increased by 20% =
20. 20.775 decreased by 8% =
21. 21.330 increased by 40% =
22. 22.235 increased by 60% =
23. 23.675 decreased by 20% =
24. 24.365 decreased by 20% =
25. 25.624 decreased by 25% =
26. 26.760 increased by 10% =
27. 27.460 increased by 15% =
28. 28.64 decreased by 50% =
29. 29.380 decreased by 15% =
30. 30.600 increased by 35% =
31. 31.364 decreased by 75% =
32. 32.400 decreased by 30% =
33. 33.532 increased by 25% =
34. 34.400 increased by 35% =
35. 35.200 decreased by 8% =
36. 36.200 decreased by 25% =
37. 37.58 increased by 50% =
38. 38.700 increased by 12% =
39. 39.75 increased by 8% =
40. 40.100 decreased by 5% =

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