Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 636 · 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. 1.112 increased by 50% =
2. 2.730 increased by 10% =
3. 3.680 decreased by 10% =
4. 4.620 decreased by 15% =
5. 5.200 increased by 15% =
6. 6.690 increased by 10% =
7. 7.580 increased by 10% =
8. 8.655 increased by 60% =
9. 9.335 decreased by 40% =
10. 10.450 decreased by 12% =
11. 11.580 decreased by 35% =
12. 12.550 increased by 10% =
13. 13.180 increased by 35% =
14. 14.150 increased by 12% =
15. 15.630 decreased by 10% =
16. 16.675 increased by 12% =
17. 17.440 increased by 15% =
18. 18.584 increased by 75% =
19. 19.196 increased by 75% =
20. 20.360 increased by 5% =
21. 21.720 increased by 35% =
22. 22.340 decreased by 35% =
23. 23.120 decreased by 15% =
24. 24.592 increased by 25% =
25. 25.450 increased by 8% =
26. 26.700 decreased by 5% =
27. 27.340 increased by 35% =
28. 28.80 decreased by 15% =
29. 29.130 increased by 20% =
30. 30.210 increased by 20% =
31. 31.220 decreased by 15% =
32. 32.108 increased by 75% =
33. 33.292 decreased by 25% =
34. 34.432 increased by 50% =
35. 35.720 increased by 5% =
36. 36.340 decreased by 10% =
37. 37.290 increased by 40% =
38. 38.520 decreased by 15% =
39. 39.320 increased by 5% =
40. 40.795 increased by 60% =

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