Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 931 · 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. 1.370 increased by 40% =
2. 2.420 decreased by 25% =
3. 3.208 decreased by 50% =
4. 4.450 decreased by 40% =
5. 5.560 decreased by 40% =
6. 6.660 decreased by 35% =
7. 7.270 increased by 60% =
8. 8.440 increased by 5% =
9. 9.225 decreased by 12% =
10. 10.60 increased by 5% =
11. 11.660 increased by 15% =
12. 12.550 increased by 50% =
13. 13.40 increased by 15% =
14. 14.720 increased by 5% =
15. 15.120 increased by 5% =
16. 16.370 increased by 60% =
17. 17.790 increased by 30% =
18. 18.535 increased by 40% =
19. 19.240 increased by 5% =
20. 20.165 increased by 60% =
21. 21.580 increased by 20% =
22. 22.420 increased by 5% =
23. 23.525 decreased by 8% =
24. 24.415 increased by 20% =
25. 25.84 decreased by 25% =
26. 26.60 decreased by 5% =
27. 27.772 decreased by 75% =
28. 28.680 decreased by 35% =
29. 29.400 increased by 30% =
30. 30.260 decreased by 35% =
31. 31.525 increased by 20% =
32. 32.220 increased by 15% =
33. 33.125 decreased by 8% =
34. 34.420 increased by 15% =
35. 35.90 increased by 60% =
36. 36.720 decreased by 5% =
37. 37.275 decreased by 12% =
38. 38.800 decreased by 10% =
39. 39.360 increased by 35% =
40. 40.760 increased by 20% =

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