Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 301 · 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. 1.78 decreased by 50% =
2. 2.540 increased by 5% =
3. 3.156 decreased by 50% =
4. 4.176 increased by 75% =
5. 5.480 increased by 35% =
6. 6.772 decreased by 25% =
7. 7.50 increased by 30% =
8. 8.756 increased by 25% =
9. 9.90 decreased by 40% =
10. 10.275 increased by 12% =
11. 11.708 decreased by 75% =
12. 12.780 increased by 5% =
13. 13.440 decreased by 5% =
14. 14.60 decreased by 15% =
15. 15.530 increased by 20% =
16. 16.740 increased by 15% =
17. 17.350 increased by 30% =
18. 18.692 increased by 75% =
19. 19.132 increased by 25% =
20. 20.675 increased by 8% =
21. 21.464 decreased by 25% =
22. 22.480 increased by 75% =
23. 23.40 decreased by 15% =
24. 24.85 decreased by 20% =
25. 25.790 increased by 10% =
26. 26.320 decreased by 30% =
27. 27.160 decreased by 40% =
28. 28.65 increased by 20% =
29. 29.460 increased by 25% =
30. 30.80 increased by 15% =
31. 31.330 increased by 10% =
32. 32.300 decreased by 35% =
33. 33.640 decreased by 5% =
34. 34.760 decreased by 35% =
35. 35.495 increased by 20% =
36. 36.445 increased by 20% =
37. 37.715 increased by 20% =
38. 38.350 decreased by 30% =
39. 39.228 increased by 75% =
40. 40.70 increased by 10% =

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