Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 277 · 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. 1.566 decreased by 50% =
2. 2.308 increased by 75% =
3. 3.300 decreased by 5% =
4. 4.770 increased by 10% =
5. 5.180 increased by 5% =
6. 6.300 decreased by 12% =
7. 7.690 decreased by 30% =
8. 8.430 increased by 10% =
9. 9.160 decreased by 75% =
10. 10.580 increased by 20% =
11. 11.640 decreased by 15% =
12. 12.152 decreased by 25% =
13. 13.640 decreased by 15% =
14. 14.430 decreased by 20% =
15. 15.300 increased by 12% =
16. 16.68 increased by 75% =
17. 17.180 increased by 15% =
18. 18.240 increased by 5% =
19. 19.440 decreased by 40% =
20. 20.618 increased by 50% =
21. 21.464 decreased by 25% =
22. 22.160 decreased by 25% =
23. 23.168 increased by 75% =
24. 24.450 decreased by 8% =
25. 25.720 increased by 5% =
26. 26.244 decreased by 50% =
27. 27.544 increased by 25% =
28. 28.120 decreased by 35% =
29. 29.188 increased by 75% =
30. 30.45 increased by 20% =
31. 31.240 increased by 60% =
32. 32.596 decreased by 75% =
33. 33.208 decreased by 25% =
34. 34.50 increased by 60% =
35. 35.420 increased by 35% =
36. 36.620 increased by 10% =
37. 37.344 decreased by 25% =
38. 38.635 decreased by 60% =
39. 39.800 increased by 10% =
40. 40.470 decreased by 10% =

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