Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 16 · 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. 1.740 increased by 15% =
2. 2.124 increased by 25% =
3. 3.680 decreased by 15% =
4. 4.375 decreased by 8% =
5. 5.60 decreased by 35% =
6. 6.60 increased by 35% =
7. 7.455 decreased by 20% =
8. 8.520 decreased by 40% =
9. 9.500 decreased by 8% =
10. 10.640 increased by 10% =
11. 11.225 increased by 8% =
12. 12.672 decreased by 25% =
13. 13.660 decreased by 35% =
14. 14.516 decreased by 75% =
15. 15.740 increased by 35% =
16. 16.715 increased by 60% =
17. 17.325 increased by 20% =
18. 18.120 increased by 40% =
19. 19.716 increased by 75% =
20. 20.450 decreased by 30% =
21. 21.640 decreased by 5% =
22. 22.600 increased by 5% =
23. 23.105 increased by 60% =
24. 24.535 decreased by 20% =
25. 25.800 decreased by 35% =
26. 26.224 decreased by 75% =
27. 27.245 decreased by 20% =
28. 28.90 increased by 30% =
29. 29.120 decreased by 10% =
30. 30.800 decreased by 35% =
31. 31.180 increased by 50% =
32. 32.396 increased by 75% =
33. 33.80 increased by 40% =
34. 34.375 increased by 8% =
35. 35.275 increased by 60% =
36. 36.220 increased by 5% =
37. 37.365 decreased by 60% =
38. 38.50 increased by 12% =
39. 39.425 increased by 40% =
40. 40.200 increased by 35% =

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