Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 649 · 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. 1.55 increased by 60% =
2. 2.790 increased by 30% =
3. 3.160 increased by 40% =
4. 4.275 increased by 12% =
5. 5.180 decreased by 75% =
6. 6.75 increased by 40% =
7. 7.715 decreased by 20% =
8. 8.248 increased by 75% =
9. 9.340 increased by 35% =
10. 10.260 decreased by 30% =
11. 11.768 decreased by 50% =
12. 12.175 decreased by 12% =
13. 13.86 decreased by 50% =
14. 14.652 decreased by 25% =
15. 15.340 decreased by 5% =
16. 16.150 increased by 12% =
17. 17.240 decreased by 15% =
18. 18.415 increased by 40% =
19. 19.370 increased by 10% =
20. 20.550 increased by 20% =
21. 21.108 increased by 25% =
22. 22.250 decreased by 12% =
23. 23.270 increased by 60% =
24. 24.450 decreased by 12% =
25. 25.250 decreased by 10% =
26. 26.622 decreased by 50% =
27. 27.388 decreased by 75% =
28. 28.175 increased by 20% =
29. 29.75 increased by 8% =
30. 30.160 decreased by 35% =
31. 31.120 decreased by 5% =
32. 32.50 increased by 20% =
33. 33.740 decreased by 60% =
34. 34.630 increased by 60% =
35. 35.580 increased by 15% =
36. 36.100 decreased by 35% =
37. 37.312 decreased by 25% =
38. 38.180 increased by 15% =
39. 39.120 increased by 35% =
40. 40.464 decreased by 25% =

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