Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 617 · 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. 1.200 decreased by 40% =
2. 2.496 increased by 25% =
3. 3.320 increased by 35% =
4. 4.620 increased by 60% =
5. 5.588 increased by 25% =
6. 6.200 decreased by 75% =
7. 7.760 increased by 15% =
8. 8.710 decreased by 10% =
9. 9.785 increased by 20% =
10. 10.440 increased by 15% =
11. 11.160 decreased by 35% =
12. 12.120 decreased by 10% =
13. 13.224 increased by 75% =
14. 14.380 increased by 25% =
15. 15.750 decreased by 12% =
16. 16.730 increased by 20% =
17. 17.375 decreased by 8% =
18. 18.740 decreased by 35% =
19. 19.508 decreased by 25% =
20. 20.45 increased by 40% =
21. 21.650 increased by 10% =
22. 22.76 decreased by 50% =
23. 23.650 increased by 12% =
24. 24.255 increased by 20% =
25. 25.640 decreased by 30% =
26. 26.588 increased by 25% =
27. 27.760 decreased by 5% =
28. 28.650 decreased by 10% =
29. 29.630 decreased by 10% =
30. 30.680 increased by 35% =
31. 31.180 increased by 30% =
32. 32.50 increased by 12% =
33. 33.206 increased by 50% =
34. 34.232 decreased by 75% =
35. 35.500 decreased by 15% =
36. 36.45 decreased by 60% =
37. 37.565 increased by 40% =
38. 38.720 decreased by 35% =
39. 39.190 increased by 20% =
40. 40.560 decreased by 15% =

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