Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 220 · 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. 1.760 increased by 15% =
2. 2.125 increased by 12% =
3. 3.440 increased by 25% =
4. 4.220 increased by 35% =
5. 5.278 increased by 50% =
6. 6.125 decreased by 8% =
7. 7.126 decreased by 50% =
8. 8.735 decreased by 40% =
9. 9.380 increased by 15% =
10. 10.464 increased by 25% =
11. 11.740 decreased by 15% =
12. 12.132 increased by 50% =
13. 13.500 decreased by 5% =
14. 14.360 increased by 15% =
15. 15.80 decreased by 5% =
16. 16.120 increased by 60% =
17. 17.500 decreased by 35% =
18. 18.660 decreased by 5% =
19. 19.490 increased by 30% =
20. 20.655 decreased by 40% =
21. 21.78 decreased by 50% =
22. 22.150 increased by 30% =
23. 23.460 increased by 15% =
24. 24.125 decreased by 20% =
25. 25.60 increased by 15% =
26. 26.420 decreased by 5% =
27. 27.500 increased by 15% =
28. 28.350 increased by 8% =
29. 29.500 decreased by 5% =
30. 30.340 increased by 35% =
31. 31.225 increased by 12% =
32. 32.360 increased by 35% =
33. 33.140 decreased by 5% =
34. 34.400 decreased by 35% =
35. 35.220 increased by 15% =
36. 36.612 decreased by 25% =
37. 37.150 increased by 30% =
38. 38.460 decreased by 5% =
39. 39.518 increased by 50% =
40. 40.435 decreased by 40% =

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