Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 152 · 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. 1.170 decreased by 40% =
2. 2.510 decreased by 30% =
3. 3.260 decreased by 60% =
4. 4.752 decreased by 25% =
5. 5.285 increased by 60% =
6. 6.300 decreased by 15% =
7. 7.780 increased by 10% =
8. 8.130 increased by 30% =
9. 9.565 decreased by 20% =
10. 10.60 increased by 30% =
11. 11.275 increased by 8% =
12. 12.300 decreased by 12% =
13. 13.196 decreased by 75% =
14. 14.570 increased by 40% =
15. 15.185 decreased by 60% =
16. 16.480 decreased by 5% =
17. 17.520 increased by 5% =
18. 18.275 decreased by 8% =
19. 19.120 increased by 5% =
20. 20.484 decreased by 25% =
21. 21.175 decreased by 12% =
22. 22.530 increased by 20% =
23. 23.485 decreased by 40% =
24. 24.304 increased by 25% =
25. 25.540 increased by 75% =
26. 26.240 increased by 50% =
27. 27.665 increased by 40% =
28. 28.500 decreased by 12% =
29. 29.425 increased by 12% =
30. 30.335 increased by 20% =
31. 31.700 decreased by 12% =
32. 32.120 decreased by 10% =
33. 33.375 decreased by 8% =
34. 34.440 increased by 5% =
35. 35.376 decreased by 75% =
36. 36.325 increased by 12% =
37. 37.44 decreased by 25% =
38. 38.700 decreased by 35% =
39. 39.800 increased by 5% =
40. 40.98 decreased by 50% =

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