Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 953 · 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. 1.270 increased by 50% =
2. 2.525 increased by 60% =
3. 3.780 decreased by 35% =
4. 4.336 increased by 50% =
5. 5.350 increased by 40% =
6. 6.480 increased by 5% =
7. 7.640 decreased by 10% =
8. 8.435 increased by 20% =
9. 9.170 decreased by 30% =
10. 10.200 decreased by 40% =
11. 11.305 decreased by 20% =
12. 12.276 decreased by 75% =
13. 13.610 increased by 60% =
14. 14.155 increased by 20% =
15. 15.210 decreased by 20% =
16. 16.580 increased by 5% =
17. 17.480 increased by 15% =
18. 18.640 decreased by 10% =
19. 19.320 decreased by 5% =
20. 20.220 increased by 35% =
21. 21.760 increased by 35% =
22. 22.234 increased by 50% =
23. 23.80 decreased by 20% =
24. 24.462 decreased by 50% =
25. 25.350 decreased by 60% =
26. 26.50 decreased by 8% =
27. 27.400 increased by 8% =
28. 28.478 increased by 50% =
29. 29.50 decreased by 20% =
30. 30.120 decreased by 10% =
31. 31.575 decreased by 8% =
32. 32.380 increased by 20% =
33. 33.300 increased by 10% =
34. 34.475 increased by 12% =
35. 35.450 decreased by 8% =
36. 36.560 increased by 15% =
37. 37.420 decreased by 15% =
38. 38.350 increased by 12% =
39. 39.40 decreased by 15% =
40. 40.70 decreased by 30% =

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