Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 670 · 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. 1.644 increased by 25% =
2. 2.400 decreased by 15% =
3. 3.400 increased by 8% =
4. 4.640 increased by 15% =
5. 5.800 decreased by 30% =
6. 6.580 increased by 5% =
7. 7.412 decreased by 75% =
8. 8.80 increased by 15% =
9. 9.700 decreased by 5% =
10. 10.755 decreased by 60% =
11. 11.125 increased by 12% =
12. 12.80 decreased by 15% =
13. 13.630 decreased by 30% =
14. 14.200 decreased by 15% =
15. 15.68 increased by 75% =
16. 16.475 increased by 8% =
17. 17.600 decreased by 8% =
18. 18.550 decreased by 50% =
19. 19.430 increased by 30% =
20. 20.800 increased by 12% =
21. 21.418 increased by 50% =
22. 22.60 increased by 35% =
23. 23.440 increased by 30% =
24. 24.440 decreased by 5% =
25. 25.120 increased by 5% =
26. 26.200 decreased by 35% =
27. 27.550 increased by 8% =
28. 28.292 increased by 25% =
29. 29.650 increased by 8% =
30. 30.276 increased by 25% =
31. 31.220 increased by 5% =
32. 32.425 increased by 8% =
33. 33.332 decreased by 50% =
34. 34.580 decreased by 60% =
35. 35.580 decreased by 40% =
36. 36.670 increased by 20% =
37. 37.100 decreased by 5% =
38. 38.100 increased by 35% =
39. 39.725 increased by 12% =
40. 40.540 decreased by 15% =

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