Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 389 · 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. 1.475 decreased by 8% =
2. 2.285 decreased by 60% =
3. 3.420 decreased by 30% =
4. 4.340 increased by 5% =
5. 5.140 decreased by 15% =
6. 6.640 decreased by 35% =
7. 7.160 increased by 15% =
8. 8.682 increased by 50% =
9. 9.800 decreased by 15% =
10. 10.432 increased by 75% =
11. 11.250 increased by 8% =
12. 12.108 increased by 75% =
13. 13.100 increased by 12% =
14. 14.724 increased by 25% =
15. 15.290 decreased by 30% =
16. 16.795 decreased by 20% =
17. 17.480 increased by 5% =
18. 18.600 increased by 10% =
19. 19.630 decreased by 30% =
20. 20.178 decreased by 50% =
21. 21.772 increased by 75% =
22. 22.750 decreased by 30% =
23. 23.360 increased by 5% =
24. 24.430 decreased by 20% =
25. 25.475 decreased by 8% =
26. 26.236 decreased by 25% =
27. 27.240 decreased by 15% =
28. 28.45 decreased by 60% =
29. 29.500 increased by 10% =
30. 30.570 increased by 50% =
31. 31.588 decreased by 50% =
32. 32.460 increased by 25% =
33. 33.610 decreased by 20% =
34. 34.355 increased by 60% =
35. 35.228 decreased by 75% =
36. 36.700 decreased by 10% =
37. 37.220 increased by 35% =
38. 38.560 increased by 60% =
39. 39.525 decreased by 12% =
40. 40.710 decreased by 60% =

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