Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 640 · 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. 1.535 decreased by 40% =
2. 2.525 increased by 20% =
3. 3.590 increased by 60% =
4. 4.544 increased by 25% =
5. 5.740 decreased by 5% =
6. 6.430 increased by 60% =
7. 7.380 decreased by 15% =
8. 8.725 increased by 8% =
9. 9.75 decreased by 8% =
10. 10.130 increased by 30% =
11. 11.380 increased by 15% =
12. 12.100 increased by 12% =
13. 13.100 decreased by 12% =
14. 14.380 decreased by 5% =
15. 15.720 increased by 60% =
16. 16.740 increased by 5% =
17. 17.690 increased by 10% =
18. 18.208 increased by 75% =
19. 19.240 decreased by 30% =
20. 20.220 increased by 15% =
21. 21.625 increased by 12% =
22. 22.185 increased by 40% =
23. 23.456 decreased by 75% =
24. 24.75 decreased by 8% =
25. 25.120 decreased by 15% =
26. 26.520 decreased by 10% =
27. 27.338 decreased by 50% =
28. 28.640 decreased by 60% =
29. 29.125 decreased by 12% =
30. 30.50 decreased by 12% =
31. 31.325 increased by 8% =
32. 32.156 decreased by 75% =
33. 33.75 increased by 12% =
34. 34.260 increased by 15% =
35. 35.160 increased by 15% =
36. 36.440 increased by 30% =
37. 37.535 decreased by 40% =
38. 38.490 increased by 40% =
39. 39.60 decreased by 15% =
40. 40.426 increased by 50% =

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