Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 738 · 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. 1.670 increased by 10% =
2. 2.284 increased by 25% =
3. 3.545 decreased by 20% =
4. 4.135 increased by 20% =
5. 5.800 increased by 12% =
6. 6.460 increased by 25% =
7. 7.210 increased by 30% =
8. 8.320 increased by 35% =
9. 9.338 decreased by 50% =
10. 10.460 decreased by 40% =
11. 11.740 increased by 10% =
12. 12.255 decreased by 20% =
13. 13.530 decreased by 30% =
14. 14.570 increased by 60% =
15. 15.220 decreased by 30% =
16. 16.800 increased by 25% =
17. 17.525 decreased by 40% =
18. 18.290 decreased by 30% =
19. 19.575 increased by 12% =
20. 20.125 increased by 12% =
21. 21.708 increased by 50% =
22. 22.80 decreased by 5% =
23. 23.700 decreased by 8% =
24. 24.304 increased by 25% =
25. 25.496 decreased by 50% =
26. 26.630 decreased by 30% =
27. 27.300 decreased by 12% =
28. 28.180 decreased by 35% =
29. 29.500 increased by 35% =
30. 30.580 increased by 35% =
31. 31.680 increased by 5% =
32. 32.445 decreased by 60% =
33. 33.375 increased by 8% =
34. 34.590 increased by 60% =
35. 35.80 decreased by 60% =
36. 36.450 decreased by 30% =
37. 37.220 increased by 10% =
38. 38.432 increased by 75% =
39. 39.480 increased by 15% =
40. 40.475 increased by 12% =

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