Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 820 · 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. 1.550 decreased by 12% =
2. 2.770 decreased by 10% =
3. 3.50 increased by 8% =
4. 4.380 increased by 30% =
5. 5.216 increased by 25% =
6. 6.125 decreased by 8% =
7. 7.390 decreased by 60% =
8. 8.525 increased by 12% =
9. 9.60 increased by 10% =
10. 10.300 increased by 15% =
11. 11.675 increased by 8% =
12. 12.450 increased by 12% =
13. 13.80 decreased by 35% =
14. 14.550 increased by 30% =
15. 15.800 increased by 5% =
16. 16.560 increased by 50% =
17. 17.388 decreased by 25% =
18. 18.480 increased by 15% =
19. 19.465 increased by 20% =
20. 20.430 decreased by 40% =
21. 21.196 increased by 75% =
22. 22.480 decreased by 15% =
23. 23.220 decreased by 5% =
24. 24.132 increased by 75% =
25. 25.700 decreased by 15% =
26. 26.200 decreased by 15% =
27. 27.700 increased by 25% =
28. 28.135 decreased by 20% =
29. 29.440 increased by 35% =
30. 30.540 increased by 35% =
31. 31.360 decreased by 15% =
32. 32.370 increased by 20% =
33. 33.550 increased by 8% =
34. 34.740 increased by 30% =
35. 35.125 increased by 8% =
36. 36.520 increased by 35% =
37. 37.400 increased by 35% =
38. 38.325 increased by 12% =
39. 39.164 decreased by 75% =
40. 40.580 increased by 5% =

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