Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 166 · 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. 1.295 increased by 20% =
2. 2.575 decreased by 12% =
3. 3.600 increased by 25% =
4. 4.100 increased by 15% =
5. 5.500 increased by 5% =
6. 6.540 increased by 35% =
7. 7.145 increased by 20% =
8. 8.430 decreased by 10% =
9. 9.520 decreased by 15% =
10. 10.160 increased by 60% =
11. 11.480 increased by 15% =
12. 12.230 increased by 10% =
13. 13.130 increased by 10% =
14. 14.612 decreased by 25% =
15. 15.785 decreased by 60% =
16. 16.260 increased by 35% =
17. 17.588 decreased by 25% =
18. 18.60 increased by 10% =
19. 19.50 increased by 12% =
20. 20.460 decreased by 5% =
21. 21.350 increased by 12% =
22. 22.660 increased by 15% =
23. 23.700 increased by 35% =
24. 24.760 increased by 10% =
25. 25.190 decreased by 60% =
26. 26.300 increased by 5% =
27. 27.120 decreased by 40% =
28. 28.740 decreased by 5% =
29. 29.675 increased by 40% =
30. 30.90 increased by 10% =
31. 31.688 increased by 25% =
32. 32.320 increased by 10% =
33. 33.380 decreased by 10% =
34. 34.660 increased by 75% =
35. 35.680 decreased by 60% =
36. 36.252 increased by 25% =
37. 37.220 increased by 5% =
38. 38.672 increased by 75% =
39. 39.380 decreased by 30% =
40. 40.800 increased by 12% =

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