Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 9 · 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. 1.430 decreased by 30% =
2. 2.536 increased by 50% =
3. 3.460 decreased by 25% =
4. 4.440 increased by 5% =
5. 5.720 increased by 15% =
6. 6.200 decreased by 60% =
7. 7.510 increased by 20% =
8. 8.740 increased by 35% =
9. 9.572 increased by 25% =
10. 10.616 increased by 75% =
11. 11.660 increased by 30% =
12. 12.645 increased by 40% =
13. 13.600 increased by 10% =
14. 14.308 decreased by 75% =
15. 15.304 decreased by 75% =
16. 16.75 increased by 12% =
17. 17.500 decreased by 30% =
18. 18.640 increased by 15% =
19. 19.80 increased by 35% =
20. 20.490 increased by 20% =
21. 21.460 increased by 5% =
22. 22.205 increased by 60% =
23. 23.425 increased by 60% =
24. 24.250 decreased by 30% =
25. 25.465 decreased by 40% =
26. 26.775 increased by 12% =
27. 27.240 increased by 15% =
28. 28.356 decreased by 25% =
29. 29.450 increased by 12% =
30. 30.60 decreased by 5% =
31. 31.632 increased by 50% =
32. 32.316 decreased by 75% =
33. 33.225 decreased by 40% =
34. 34.660 decreased by 5% =
35. 35.50 increased by 12% =
36. 36.704 increased by 50% =
37. 37.64 increased by 75% =
38. 38.410 increased by 10% =
39. 39.300 decreased by 30% =
40. 40.120 decreased by 15% =

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