Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 466 · 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. 1.630 increased by 50% =
2. 2.275 increased by 12% =
3. 3.635 decreased by 40% =
4. 4.560 decreased by 30% =
5. 5.75 increased by 12% =
6. 6.160 decreased by 35% =
7. 7.120 decreased by 35% =
8. 8.110 increased by 40% =
9. 9.685 increased by 20% =
10. 10.60 decreased by 20% =
11. 11.545 increased by 20% =
12. 12.710 decreased by 10% =
13. 13.680 increased by 40% =
14. 14.390 decreased by 20% =
15. 15.790 decreased by 40% =
16. 16.240 increased by 35% =
17. 17.80 decreased by 75% =
18. 18.550 increased by 40% =
19. 19.425 increased by 8% =
20. 20.780 increased by 30% =
21. 21.560 decreased by 35% =
22. 22.430 increased by 50% =
23. 23.200 decreased by 8% =
24. 24.800 increased by 15% =
25. 25.536 increased by 25% =
26. 26.428 increased by 50% =
27. 27.148 increased by 50% =
28. 28.60 increased by 15% =
29. 29.450 decreased by 8% =
30. 30.620 decreased by 75% =
31. 31.112 decreased by 50% =
32. 32.350 increased by 20% =
33. 33.740 increased by 35% =
34. 34.75 increased by 20% =
35. 35.760 increased by 10% =
36. 36.500 increased by 12% =
37. 37.552 decreased by 75% =
38. 38.90 increased by 50% =
39. 39.425 decreased by 8% =
40. 40.534 decreased by 50% =

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