Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 559 · 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. 1.205 increased by 20% =
2. 2.240 increased by 15% =
3. 3.730 increased by 10% =
4. 4.380 increased by 15% =
5. 5.560 increased by 75% =
6. 6.240 decreased by 20% =
7. 7.175 increased by 12% =
8. 8.400 increased by 20% =
9. 9.155 decreased by 20% =
10. 10.640 increased by 10% =
11. 11.640 decreased by 15% =
12. 12.600 increased by 40% =
13. 13.600 increased by 15% =
14. 14.200 increased by 15% =
15. 15.75 decreased by 12% =
16. 16.560 decreased by 35% =
17. 17.430 increased by 30% =
18. 18.410 increased by 60% =
19. 19.675 increased by 40% =
20. 20.140 decreased by 10% =
21. 21.625 decreased by 12% =
22. 22.385 increased by 40% =
23. 23.512 increased by 50% =
24. 24.735 increased by 20% =
25. 25.560 decreased by 15% =
26. 26.220 increased by 60% =
27. 27.40 increased by 5% =
28. 28.632 increased by 25% =
29. 29.710 decreased by 30% =
30. 30.740 decreased by 5% =
31. 31.675 decreased by 40% =
32. 32.600 increased by 35% =
33. 33.150 increased by 40% =
34. 34.60 increased by 75% =
35. 35.690 increased by 10% =
36. 36.232 decreased by 75% =
37. 37.210 increased by 30% =
38. 38.700 decreased by 5% =
39. 39.775 decreased by 8% =
40. 40.466 increased by 50% =

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