Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 436 · 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. 1.125 increased by 8% =
2. 2.500 decreased by 20% =
3. 3.300 decreased by 8% =
4. 4.660 increased by 30% =
5. 5.180 increased by 5% =
6. 6.575 increased by 12% =
7. 7.620 decreased by 35% =
8. 8.240 increased by 60% =
9. 9.230 increased by 10% =
10. 10.200 decreased by 20% =
11. 11.420 decreased by 5% =
12. 12.456 increased by 25% =
13. 13.88 decreased by 25% =
14. 14.360 decreased by 5% =
15. 15.780 decreased by 60% =
16. 16.375 decreased by 40% =
17. 17.70 decreased by 40% =
18. 18.290 increased by 30% =
19. 19.660 decreased by 5% =
20. 20.140 increased by 20% =
21. 21.720 decreased by 40% =
22. 22.435 increased by 60% =
23. 23.80 increased by 35% =
24. 24.755 increased by 40% =
25. 25.240 increased by 5% =
26. 26.255 increased by 20% =
27. 27.340 decreased by 35% =
28. 28.284 decreased by 25% =
29. 29.648 increased by 25% =
30. 30.250 increased by 10% =
31. 31.128 decreased by 50% =
32. 32.470 decreased by 50% =
33. 33.118 decreased by 50% =
34. 34.440 increased by 15% =
35. 35.250 decreased by 10% =
36. 36.108 decreased by 25% =
37. 37.390 decreased by 10% =
38. 38.410 decreased by 30% =
39. 39.575 decreased by 12% =
40. 40.480 decreased by 5% =

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