Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 55 · 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. 1.120 increased by 10% =
2. 2.160 decreased by 60% =
3. 3.180 decreased by 15% =
4. 4.800 increased by 5% =
5. 5.660 decreased by 30% =
6. 6.480 decreased by 50% =
7. 7.60 increased by 50% =
8. 8.240 increased by 60% =
9. 9.220 decreased by 10% =
10. 10.120 decreased by 5% =
11. 11.60 increased by 30% =
12. 12.140 decreased by 35% =
13. 13.120 increased by 30% =
14. 14.100 decreased by 8% =
15. 15.375 decreased by 40% =
16. 16.425 decreased by 8% =
17. 17.580 increased by 10% =
18. 18.670 increased by 60% =
19. 19.284 increased by 75% =
20. 20.720 increased by 10% =
21. 21.680 increased by 50% =
22. 22.420 increased by 40% =
23. 23.360 increased by 15% =
24. 24.730 decreased by 20% =
25. 25.525 decreased by 12% =
26. 26.320 increased by 40% =
27. 27.475 increased by 60% =
28. 28.270 increased by 30% =
29. 29.372 decreased by 25% =
30. 30.425 increased by 40% =
31. 31.672 decreased by 75% =
32. 32.470 increased by 40% =
33. 33.800 increased by 15% =
34. 34.648 decreased by 75% =
35. 35.520 decreased by 35% =
36. 36.232 increased by 75% =
37. 37.155 increased by 20% =
38. 38.150 decreased by 10% =
39. 39.75 increased by 8% =
40. 40.460 decreased by 15% =

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