Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 127 · 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. 1.760 decreased by 30% =
2. 2.380 decreased by 15% =
3. 3.240 decreased by 10% =
4. 4.250 increased by 10% =
5. 5.85 increased by 40% =
6. 6.160 decreased by 35% =
7. 7.450 increased by 10% =
8. 8.320 increased by 10% =
9. 9.424 increased by 75% =
10. 10.346 decreased by 50% =
11. 11.525 increased by 12% =
12. 12.164 decreased by 50% =
13. 13.260 decreased by 60% =
14. 14.575 increased by 12% =
15. 15.225 increased by 12% =
16. 16.700 decreased by 5% =
17. 17.80 increased by 35% =
18. 18.80 increased by 60% =
19. 19.400 decreased by 40% =
20. 20.315 increased by 40% =
21. 21.460 decreased by 40% =
22. 22.70 decreased by 20% =
23. 23.150 decreased by 12% =
24. 24.620 decreased by 5% =
25. 25.720 decreased by 5% =
26. 26.340 increased by 20% =
27. 27.720 increased by 10% =
28. 28.60 decreased by 35% =
29. 29.400 increased by 12% =
30. 30.650 decreased by 12% =
31. 31.500 increased by 12% =
32. 32.440 increased by 5% =
33. 33.188 decreased by 75% =
34. 34.180 decreased by 5% =
35. 35.365 decreased by 40% =
36. 36.260 increased by 30% =
37. 37.560 decreased by 20% =
38. 38.134 increased by 50% =
39. 39.120 increased by 5% =
40. 40.460 increased by 10% =

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