Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 115 · 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. 1.230 increased by 60% =
2. 2.540 increased by 10% =
3. 3.720 increased by 15% =
4. 4.500 increased by 15% =
5. 5.120 decreased by 10% =
6. 6.790 increased by 20% =
7. 7.324 decreased by 50% =
8. 8.530 increased by 10% =
9. 9.780 increased by 20% =
10. 10.265 decreased by 60% =
11. 11.140 decreased by 5% =
12. 12.550 increased by 20% =
13. 13.328 increased by 25% =
14. 14.150 increased by 30% =
15. 15.500 increased by 35% =
16. 16.140 increased by 60% =
17. 17.700 increased by 15% =
18. 18.750 increased by 12% =
19. 19.456 decreased by 75% =
20. 20.145 decreased by 60% =
21. 21.112 increased by 50% =
22. 22.135 decreased by 20% =
23. 23.40 decreased by 5% =
24. 24.600 increased by 10% =
25. 25.520 decreased by 30% =
26. 26.200 increased by 30% =
27. 27.340 increased by 10% =
28. 28.180 increased by 10% =
29. 29.600 decreased by 40% =
30. 30.620 decreased by 35% =
31. 31.200 decreased by 5% =
32. 32.610 increased by 40% =
33. 33.600 decreased by 60% =
34. 34.360 increased by 15% =
35. 35.115 increased by 60% =
36. 36.450 decreased by 8% =
37. 37.636 decreased by 25% =
38. 38.495 increased by 40% =
39. 39.52 increased by 75% =
40. 40.290 decreased by 10% =

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