Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 826 · 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 20% =
2. 2.380 decreased by 10% =
3. 3.284 increased by 75% =
4. 4.60 increased by 20% =
5. 5.450 increased by 30% =
6. 6.600 decreased by 35% =
7. 7.80 increased by 20% =
8. 8.510 increased by 10% =
9. 9.530 increased by 10% =
10. 10.660 decreased by 20% =
11. 11.560 increased by 35% =
12. 12.225 decreased by 12% =
13. 13.100 decreased by 12% =
14. 14.140 decreased by 10% =
15. 15.645 decreased by 60% =
16. 16.375 decreased by 60% =
17. 17.394 increased by 50% =
18. 18.80 decreased by 35% =
19. 19.130 increased by 30% =
20. 20.70 increased by 30% =
21. 21.724 decreased by 75% =
22. 22.230 increased by 10% =
23. 23.270 increased by 60% =
24. 24.244 decreased by 25% =
25. 25.315 increased by 60% =
26. 26.400 increased by 15% =
27. 27.160 increased by 40% =
28. 28.60 increased by 75% =
29. 29.620 decreased by 5% =
30. 30.680 increased by 35% =
31. 31.360 increased by 60% =
32. 32.512 decreased by 25% =
33. 33.128 increased by 75% =
34. 34.200 decreased by 12% =
35. 35.440 increased by 5% =
36. 36.220 increased by 40% =
37. 37.590 decreased by 30% =
38. 38.235 increased by 40% =
39. 39.380 increased by 15% =
40. 40.600 increased by 15% =

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