Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 32 · 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. 1.708 decreased by 25% =
2. 2.675 decreased by 8% =
3. 3.450 decreased by 8% =
4. 4.50 decreased by 8% =
5. 5.740 decreased by 5% =
6. 6.305 decreased by 20% =
7. 7.730 decreased by 60% =
8. 8.150 increased by 8% =
9. 9.360 increased by 15% =
10. 10.350 decreased by 12% =
11. 11.80 decreased by 30% =
12. 12.510 increased by 10% =
13. 13.420 decreased by 15% =
14. 14.580 increased by 25% =
15. 15.775 decreased by 8% =
16. 16.640 increased by 60% =
17. 17.720 decreased by 25% =
18. 18.180 decreased by 5% =
19. 19.700 increased by 8% =
20. 20.700 increased by 12% =
21. 21.610 decreased by 60% =
22. 22.440 increased by 5% =
23. 23.60 increased by 20% =
24. 24.300 decreased by 20% =
25. 25.500 increased by 15% =
26. 26.468 increased by 25% =
27. 27.440 decreased by 35% =
28. 28.200 increased by 10% =
29. 29.800 increased by 8% =
30. 30.300 increased by 60% =
31. 31.800 decreased by 5% =
32. 32.275 decreased by 8% =
33. 33.100 increased by 8% =
34. 34.770 increased by 30% =
35. 35.250 decreased by 20% =
36. 36.140 increased by 50% =
37. 37.528 increased by 75% =
38. 38.485 increased by 60% =
39. 39.460 decreased by 15% =
40. 40.424 decreased by 25% =

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