Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 446 · 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. 1.362 decreased by 50% =
2. 2.112 decreased by 25% =
3. 3.752 increased by 75% =
4. 4.360 decreased by 10% =
5. 5.220 increased by 40% =
6. 6.450 decreased by 40% =
7. 7.260 increased by 15% =
8. 8.325 increased by 12% =
9. 9.385 increased by 40% =
10. 10.790 increased by 10% =
11. 11.175 decreased by 12% =
12. 12.210 decreased by 30% =
13. 13.145 decreased by 60% =
14. 14.595 decreased by 20% =
15. 15.45 decreased by 20% =
16. 16.720 decreased by 60% =
17. 17.64 increased by 25% =
18. 18.700 decreased by 15% =
19. 19.312 decreased by 75% =
20. 20.50 increased by 12% =
21. 21.600 increased by 35% =
22. 22.470 increased by 20% =
23. 23.240 increased by 30% =
24. 24.630 decreased by 20% =
25. 25.550 decreased by 8% =
26. 26.780 increased by 10% =
27. 27.180 decreased by 20% =
28. 28.300 increased by 5% =
29. 29.60 decreased by 15% =
30. 30.290 increased by 30% =
31. 31.130 increased by 60% =
32. 32.156 decreased by 75% =
33. 33.180 decreased by 30% =
34. 34.290 decreased by 20% =
35. 35.500 decreased by 5% =
36. 36.480 decreased by 5% =
37. 37.240 increased by 5% =
38. 38.40 increased by 60% =
39. 39.525 decreased by 12% =
40. 40.165 increased by 40% =

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