Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 380 · 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. 1.380 decreased by 10% =
2. 2.150 decreased by 40% =
3. 3.136 increased by 50% =
4. 4.320 decreased by 40% =
5. 5.420 increased by 20% =
6. 6.312 decreased by 25% =
7. 7.300 decreased by 8% =
8. 8.470 increased by 40% =
9. 9.190 decreased by 20% =
10. 10.625 decreased by 12% =
11. 11.730 increased by 30% =
12. 12.350 decreased by 12% =
13. 13.720 increased by 35% =
14. 14.125 increased by 12% =
15. 15.750 increased by 20% =
16. 16.120 increased by 5% =
17. 17.125 decreased by 8% =
18. 18.315 decreased by 60% =
19. 19.500 decreased by 10% =
20. 20.540 decreased by 5% =
21. 21.132 decreased by 50% =
22. 22.570 increased by 40% =
23. 23.625 increased by 12% =
24. 24.775 increased by 20% =
25. 25.582 decreased by 50% =
26. 26.600 increased by 30% =
27. 27.750 increased by 12% =
28. 28.50 increased by 12% =
29. 29.435 decreased by 20% =
30. 30.488 increased by 75% =
31. 31.740 increased by 5% =
32. 32.630 decreased by 30% =
33. 33.300 decreased by 10% =
34. 34.575 increased by 12% =
35. 35.602 decreased by 50% =
36. 36.375 decreased by 12% =
37. 37.304 decreased by 50% =
38. 38.480 increased by 35% =
39. 39.420 decreased by 5% =
40. 40.672 increased by 75% =

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