Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 816 · 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. 1.450 decreased by 12% =
2. 2.740 increased by 35% =
3. 3.380 increased by 30% =
4. 4.720 decreased by 35% =
5. 5.340 increased by 20% =
6. 6.690 decreased by 10% =
7. 7.200 increased by 5% =
8. 8.784 decreased by 75% =
9. 9.52 increased by 75% =
10. 10.500 decreased by 30% =
11. 11.140 increased by 40% =
12. 12.800 increased by 8% =
13. 13.45 increased by 60% =
14. 14.170 increased by 10% =
15. 15.372 decreased by 25% =
16. 16.230 increased by 20% =
17. 17.710 increased by 60% =
18. 18.410 decreased by 10% =
19. 19.64 decreased by 75% =
20. 20.665 decreased by 40% =
21. 21.470 increased by 10% =
22. 22.760 decreased by 30% =
23. 23.620 decreased by 15% =
24. 24.395 increased by 20% =
25. 25.200 decreased by 8% =
26. 26.300 increased by 40% =
27. 27.140 increased by 10% =
28. 28.240 increased by 25% =
29. 29.250 decreased by 8% =
30. 30.105 increased by 40% =
31. 31.460 increased by 15% =
32. 32.610 increased by 30% =
33. 33.630 decreased by 10% =
34. 34.250 decreased by 8% =
35. 35.625 increased by 60% =
36. 36.680 increased by 30% =
37. 37.675 increased by 8% =
38. 38.506 increased by 50% =
39. 39.490 decreased by 50% =
40. 40.40 decreased by 40% =

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