Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 715 · 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 75% =
2. 2.250 increased by 8% =
3. 3.660 decreased by 30% =
4. 4.430 decreased by 60% =
5. 5.200 decreased by 8% =
6. 6.275 increased by 20% =
7. 7.200 decreased by 8% =
8. 8.570 decreased by 30% =
9. 9.60 decreased by 5% =
10. 10.520 decreased by 35% =
11. 11.450 increased by 10% =
12. 12.300 decreased by 5% =
13. 13.635 increased by 60% =
14. 14.250 increased by 12% =
15. 15.260 increased by 20% =
16. 16.125 decreased by 20% =
17. 17.580 increased by 15% =
18. 18.700 increased by 15% =
19. 19.352 decreased by 25% =
20. 20.400 decreased by 25% =
21. 21.336 increased by 50% =
22. 22.122 increased by 50% =
23. 23.510 increased by 10% =
24. 24.650 increased by 10% =
25. 25.484 decreased by 75% =
26. 26.155 increased by 20% =
27. 27.600 increased by 15% =
28. 28.50 increased by 50% =
29. 29.220 increased by 5% =
30. 30.396 increased by 75% =
31. 31.312 decreased by 25% =
32. 32.460 increased by 10% =
33. 33.300 decreased by 12% =
34. 34.740 increased by 25% =
35. 35.540 increased by 10% =
36. 36.170 increased by 40% =
37. 37.610 increased by 30% =
38. 38.470 decreased by 10% =
39. 39.116 decreased by 75% =
40. 40.535 increased by 40% =

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