Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 453 · 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. 1.700 decreased by 12% =
2. 2.100 decreased by 35% =
3. 3.560 increased by 35% =
4. 4.425 increased by 8% =
5. 5.410 increased by 50% =
6. 6.110 increased by 50% =
7. 7.290 decreased by 30% =
8. 8.555 increased by 40% =
9. 9.530 increased by 10% =
10. 10.412 decreased by 25% =
11. 11.400 increased by 35% =
12. 12.130 increased by 50% =
13. 13.300 decreased by 40% =
14. 14.465 decreased by 20% =
15. 15.175 decreased by 12% =
16. 16.152 decreased by 75% =
17. 17.100 increased by 5% =
18. 18.220 decreased by 40% =
19. 19.80 increased by 35% =
20. 20.425 increased by 8% =
21. 21.100 increased by 8% =
22. 22.540 decreased by 10% =
23. 23.180 increased by 20% =
24. 24.648 increased by 25% =
25. 25.626 increased by 50% =
26. 26.250 increased by 12% =
27. 27.150 decreased by 10% =
28. 28.140 increased by 30% =
29. 29.780 increased by 10% =
30. 30.604 increased by 25% =
31. 31.550 increased by 12% =
32. 32.296 increased by 25% =
33. 33.225 increased by 40% =
34. 34.190 increased by 30% =
35. 35.175 decreased by 8% =
36. 36.580 increased by 15% =
37. 37.152 increased by 75% =
38. 38.200 increased by 35% =
39. 39.140 increased by 50% =
40. 40.685 decreased by 40% =

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