Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 415 · 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. 1.545 increased by 60% =
2. 2.45 decreased by 60% =
3. 3.700 increased by 8% =
4. 4.472 increased by 75% =
5. 5.755 decreased by 40% =
6. 6.580 increased by 5% =
7. 7.370 increased by 20% =
8. 8.450 decreased by 10% =
9. 9.700 decreased by 15% =
10. 10.125 decreased by 60% =
11. 11.430 decreased by 10% =
12. 12.480 decreased by 5% =
13. 13.725 increased by 60% =
14. 14.225 increased by 60% =
15. 15.550 increased by 20% =
16. 16.312 decreased by 75% =
17. 17.780 increased by 5% =
18. 18.180 decreased by 35% =
19. 19.120 increased by 5% =
20. 20.768 decreased by 75% =
21. 21.308 increased by 50% =
22. 22.140 increased by 60% =
23. 23.550 decreased by 12% =
24. 24.275 decreased by 8% =
25. 25.715 increased by 20% =
26. 26.245 decreased by 60% =
27. 27.768 decreased by 50% =
28. 28.600 decreased by 8% =
29. 29.70 increased by 30% =
30. 30.230 decreased by 30% =
31. 31.430 decreased by 30% =
32. 32.275 increased by 60% =
33. 33.295 increased by 20% =
34. 34.660 increased by 20% =
35. 35.230 decreased by 10% =
36. 36.590 increased by 20% =
37. 37.308 decreased by 25% =
38. 38.544 increased by 75% =
39. 39.160 increased by 15% =
40. 40.240 increased by 15% =

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