Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 477 · 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. 1.154 increased by 50% =
2. 2.180 increased by 15% =
3. 3.100 increased by 15% =
4. 4.120 decreased by 35% =
5. 5.300 decreased by 12% =
6. 6.680 increased by 5% =
7. 7.600 increased by 15% =
8. 8.675 decreased by 12% =
9. 9.228 decreased by 50% =
10. 10.800 increased by 5% =
11. 11.740 decreased by 10% =
12. 12.440 decreased by 5% =
13. 13.620 decreased by 15% =
14. 14.592 decreased by 25% =
15. 15.200 increased by 15% =
16. 16.240 increased by 5% =
17. 17.660 increased by 35% =
18. 18.660 decreased by 35% =
19. 19.510 increased by 10% =
20. 20.175 increased by 8% =
21. 21.350 increased by 12% =
22. 22.70 decreased by 20% =
23. 23.670 decreased by 30% =
24. 24.765 decreased by 40% =
25. 25.510 increased by 40% =
26. 26.800 increased by 30% =
27. 27.760 increased by 30% =
28. 28.800 decreased by 15% =
29. 29.130 decreased by 30% =
30. 30.140 decreased by 60% =
31. 31.780 increased by 5% =
32. 32.320 increased by 15% =
33. 33.100 increased by 35% =
34. 34.550 increased by 8% =
35. 35.800 increased by 35% =
36. 36.160 increased by 15% =
37. 37.220 decreased by 15% =
38. 38.50 decreased by 12% =
39. 39.470 increased by 30% =
40. 40.282 decreased by 50% =

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