Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 99 · 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. 1.625 decreased by 8% =
2. 2.680 increased by 35% =
3. 3.70 decreased by 50% =
4. 4.80 decreased by 35% =
5. 5.655 decreased by 20% =
6. 6.320 increased by 5% =
7. 7.380 increased by 25% =
8. 8.520 increased by 20% =
9. 9.188 increased by 25% =
10. 10.400 decreased by 15% =
11. 11.100 decreased by 12% =
12. 12.550 decreased by 8% =
13. 13.180 decreased by 35% =
14. 14.260 decreased by 15% =
15. 15.410 decreased by 10% =
16. 16.740 decreased by 10% =
17. 17.800 decreased by 40% =
18. 18.590 increased by 10% =
19. 19.480 decreased by 10% =
20. 20.460 decreased by 5% =
21. 21.660 increased by 25% =
22. 22.255 increased by 20% =
23. 23.740 increased by 5% =
24. 24.160 decreased by 40% =
25. 25.80 decreased by 15% =
26. 26.544 increased by 50% =
27. 27.300 increased by 15% =
28. 28.228 decreased by 75% =
29. 29.164 decreased by 25% =
30. 30.765 increased by 40% =
31. 31.92 decreased by 25% =
32. 32.620 increased by 30% =
33. 33.392 increased by 25% =
34. 34.250 increased by 10% =
35. 35.760 increased by 15% =
36. 36.140 decreased by 35% =
37. 37.100 decreased by 15% =
38. 38.210 decreased by 10% =
39. 39.220 increased by 35% =
40. 40.260 increased by 5% =

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