Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 19 · 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. 1.50 increased by 60% =
2. 2.460 decreased by 15% =
3. 3.200 decreased by 12% =
4. 4.264 decreased by 25% =
5. 5.500 decreased by 15% =
6. 6.40 increased by 35% =
7. 7.380 increased by 20% =
8. 8.140 decreased by 75% =
9. 9.440 decreased by 30% =
10. 10.440 increased by 15% =
11. 11.460 decreased by 15% =
12. 12.115 increased by 20% =
13. 13.600 decreased by 5% =
14. 14.660 decreased by 20% =
15. 15.525 increased by 12% =
16. 16.680 decreased by 15% =
17. 17.380 decreased by 20% =
18. 18.184 decreased by 25% =
19. 19.195 decreased by 40% =
20. 20.650 increased by 12% =
21. 21.750 decreased by 12% =
22. 22.740 decreased by 10% =
23. 23.100 increased by 8% =
24. 24.140 increased by 10% =
25. 25.232 decreased by 25% =
26. 26.610 decreased by 40% =
27. 27.380 decreased by 10% =
28. 28.740 decreased by 75% =
29. 29.595 decreased by 60% =
30. 30.340 decreased by 15% =
31. 31.60 decreased by 15% =
32. 32.660 decreased by 30% =
33. 33.500 decreased by 10% =
34. 34.700 decreased by 12% =
35. 35.180 increased by 15% =
36. 36.40 increased by 15% =
37. 37.510 decreased by 10% =
38. 38.275 increased by 12% =
39. 39.450 decreased by 8% =
40. 40.120 decreased by 10% =

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