Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 423 · 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. 1.110 decreased by 20% =
2. 2.300 increased by 35% =
3. 3.780 increased by 15% =
4. 4.625 increased by 40% =
5. 5.650 decreased by 8% =
6. 6.148 decreased by 25% =
7. 7.90 decreased by 10% =
8. 8.650 decreased by 8% =
9. 9.620 increased by 10% =
10. 10.450 decreased by 12% =
11. 11.544 decreased by 25% =
12. 12.200 decreased by 15% =
13. 13.660 decreased by 10% =
14. 14.760 increased by 75% =
15. 15.700 increased by 15% =
16. 16.220 increased by 15% =
17. 17.740 decreased by 15% =
18. 18.770 decreased by 60% =
19. 19.80 increased by 75% =
20. 20.536 decreased by 25% =
21. 21.600 increased by 5% =
22. 22.736 decreased by 25% =
23. 23.380 increased by 5% =
24. 24.778 increased by 50% =
25. 25.155 increased by 60% =
26. 26.300 increased by 5% =
27. 27.190 decreased by 10% =
28. 28.420 decreased by 5% =
29. 29.136 decreased by 75% =
30. 30.408 decreased by 25% =
31. 31.260 increased by 15% =
32. 32.540 increased by 35% =
33. 33.480 increased by 75% =
34. 34.150 increased by 12% =
35. 35.770 decreased by 60% =
36. 36.608 decreased by 25% =
37. 37.575 increased by 8% =
38. 38.715 decreased by 20% =
39. 39.410 increased by 30% =
40. 40.95 increased by 60% =

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