Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 208 · 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 increased by 12% =
2. 2.360 decreased by 10% =
3. 3.280 decreased by 5% =
4. 4.200 decreased by 8% =
5. 5.655 increased by 40% =
6. 6.480 decreased by 30% =
7. 7.570 decreased by 10% =
8. 8.630 decreased by 20% =
9. 9.136 decreased by 75% =
10. 10.800 decreased by 40% =
11. 11.660 increased by 5% =
12. 12.700 decreased by 8% =
13. 13.120 increased by 35% =
14. 14.250 increased by 12% =
15. 15.510 increased by 10% =
16. 16.440 increased by 60% =
17. 17.88 increased by 25% =
18. 18.200 decreased by 15% =
19. 19.75 increased by 8% =
20. 20.725 decreased by 8% =
21. 21.725 increased by 20% =
22. 22.620 decreased by 20% =
23. 23.250 decreased by 12% =
24. 24.495 decreased by 20% =
25. 25.300 decreased by 12% =
26. 26.350 increased by 60% =
27. 27.380 decreased by 75% =
28. 28.800 decreased by 10% =
29. 29.640 decreased by 35% =
30. 30.220 increased by 5% =
31. 31.65 decreased by 40% =
32. 32.500 decreased by 35% =
33. 33.640 decreased by 10% =
34. 34.540 decreased by 75% =
35. 35.590 decreased by 60% =
36. 36.225 increased by 8% =
37. 37.620 increased by 15% =
38. 38.720 increased by 25% =
39. 39.105 increased by 20% =
40. 40.150 increased by 30% =

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