Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 98 · 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. 1.775 decreased by 8% =
2. 2.425 increased by 40% =
3. 3.648 decreased by 50% =
4. 4.344 increased by 75% =
5. 5.215 decreased by 20% =
6. 6.450 increased by 60% =
7. 7.200 decreased by 5% =
8. 8.550 increased by 8% =
9. 9.640 increased by 5% =
10. 10.500 decreased by 8% =
11. 11.160 decreased by 5% =
12. 12.800 increased by 30% =
13. 13.74 increased by 50% =
14. 14.530 increased by 20% =
15. 15.200 increased by 5% =
16. 16.380 decreased by 20% =
17. 17.572 increased by 75% =
18. 18.730 decreased by 20% =
19. 19.140 decreased by 15% =
20. 20.385 increased by 40% =
21. 21.315 decreased by 60% =
22. 22.540 decreased by 5% =
23. 23.610 decreased by 30% =
24. 24.140 increased by 35% =
25. 25.660 increased by 15% =
26. 26.375 decreased by 8% =
27. 27.700 increased by 8% =
28. 28.660 increased by 15% =
29. 29.415 decreased by 40% =
30. 30.244 decreased by 25% =
31. 31.746 increased by 50% =
32. 32.720 decreased by 5% =
33. 33.436 decreased by 75% =
34. 34.630 decreased by 10% =
35. 35.200 decreased by 5% =
36. 36.662 increased by 50% =
37. 37.600 decreased by 35% =
38. 38.580 increased by 15% =
39. 39.470 increased by 20% =
40. 40.220 decreased by 5% =

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