Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 417 · 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. 1.760 increased by 15% =
2. 2.40 decreased by 5% =
3. 3.275 increased by 12% =
4. 4.240 decreased by 15% =
5. 5.500 decreased by 15% =
6. 6.460 decreased by 20% =
7. 7.275 decreased by 12% =
8. 8.410 increased by 10% =
9. 9.310 decreased by 30% =
10. 10.640 increased by 10% =
11. 11.190 decreased by 10% =
12. 12.340 increased by 15% =
13. 13.170 decreased by 40% =
14. 14.760 increased by 5% =
15. 15.140 increased by 35% =
16. 16.412 increased by 25% =
17. 17.394 increased by 50% =
18. 18.350 increased by 8% =
19. 19.675 decreased by 60% =
20. 20.405 decreased by 40% =
21. 21.760 increased by 10% =
22. 22.510 increased by 30% =
23. 23.132 decreased by 75% =
24. 24.605 increased by 60% =
25. 25.650 decreased by 8% =
26. 26.564 decreased by 50% =
27. 27.190 decreased by 20% =
28. 28.270 increased by 30% =
29. 29.350 increased by 30% =
30. 30.105 increased by 40% =
31. 31.215 increased by 20% =
32. 32.160 increased by 40% =
33. 33.608 decreased by 75% =
34. 34.436 decreased by 25% =
35. 35.136 decreased by 50% =
36. 36.275 decreased by 8% =
37. 37.788 decreased by 25% =
38. 38.260 increased by 5% =
39. 39.140 increased by 15% =
40. 40.695 increased by 40% =

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