Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 442 · 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. 1.790 increased by 30% =
2. 2.680 decreased by 15% =
3. 3.180 decreased by 5% =
4. 4.120 increased by 5% =
5. 5.600 decreased by 8% =
6. 6.720 increased by 30% =
7. 7.608 increased by 75% =
8. 8.670 decreased by 60% =
9. 9.180 increased by 35% =
10. 10.225 decreased by 40% =
11. 11.670 increased by 20% =
12. 12.260 increased by 60% =
13. 13.740 decreased by 5% =
14. 14.720 increased by 5% =
15. 15.225 decreased by 12% =
16. 16.235 increased by 60% =
17. 17.436 increased by 25% =
18. 18.160 decreased by 35% =
19. 19.460 decreased by 30% =
20. 20.380 decreased by 40% =
21. 21.610 decreased by 20% =
22. 22.40 increased by 15% =
23. 23.765 increased by 20% =
24. 24.530 decreased by 40% =
25. 25.745 decreased by 20% =
26. 26.140 increased by 50% =
27. 27.550 increased by 12% =
28. 28.768 increased by 25% =
29. 29.415 increased by 60% =
30. 30.680 increased by 15% =
31. 31.224 increased by 75% =
32. 32.655 decreased by 40% =
33. 33.520 decreased by 30% =
34. 34.630 decreased by 20% =
35. 35.68 decreased by 50% =
36. 36.70 increased by 50% =
37. 37.496 decreased by 75% =
38. 38.680 decreased by 30% =
39. 39.470 decreased by 30% =
40. 40.320 increased by 15% =

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