Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 420 · 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. 1.575 decreased by 12% =
2. 2.580 decreased by 30% =
3. 3.500 decreased by 12% =
4. 4.185 increased by 40% =
5. 5.740 decreased by 30% =
6. 6.245 decreased by 20% =
7. 7.728 increased by 50% =
8. 8.205 increased by 60% =
9. 9.525 decreased by 20% =
10. 10.304 increased by 25% =
11. 11.470 increased by 30% =
12. 12.310 decreased by 60% =
13. 13.40 increased by 10% =
14. 14.480 decreased by 10% =
15. 15.608 increased by 75% =
16. 16.220 increased by 5% =
17. 17.525 increased by 40% =
18. 18.360 increased by 15% =
19. 19.430 increased by 10% =
20. 20.365 decreased by 60% =
21. 21.720 decreased by 15% =
22. 22.500 increased by 35% =
23. 23.550 increased by 60% =
24. 24.690 increased by 40% =
25. 25.740 increased by 30% =
26. 26.790 decreased by 60% =
27. 27.65 decreased by 60% =
28. 28.370 increased by 10% =
29. 29.180 decreased by 5% =
30. 30.640 decreased by 15% =
31. 31.190 decreased by 40% =
32. 32.800 decreased by 12% =
33. 33.160 increased by 15% =
34. 34.180 increased by 35% =
35. 35.305 increased by 20% =
36. 36.524 decreased by 25% =
37. 37.220 decreased by 40% =
38. 38.100 decreased by 8% =
39. 39.630 increased by 30% =
40. 40.110 decreased by 60% =

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