Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 958 · 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. 1.320 decreased by 40% =
2. 2.150 decreased by 30% =
3. 3.130 decreased by 10% =
4. 4.775 decreased by 12% =
5. 5.750 increased by 20% =
6. 6.120 increased by 5% =
7. 7.684 increased by 50% =
8. 8.425 decreased by 40% =
9. 9.180 increased by 20% =
10. 10.200 decreased by 15% =
11. 11.690 increased by 10% =
12. 12.450 increased by 8% =
13. 13.560 decreased by 5% =
14. 14.410 increased by 10% =
15. 15.240 decreased by 20% =
16. 16.576 increased by 25% =
17. 17.175 increased by 8% =
18. 18.615 decreased by 60% =
19. 19.735 decreased by 20% =
20. 20.560 decreased by 5% =
21. 21.180 decreased by 20% =
22. 22.345 decreased by 20% =
23. 23.680 decreased by 5% =
24. 24.210 decreased by 50% =
25. 25.500 decreased by 8% =
26. 26.800 increased by 50% =
27. 27.120 decreased by 40% =
28. 28.550 decreased by 8% =
29. 29.315 increased by 20% =
30. 30.715 increased by 60% =
31. 31.552 increased by 25% =
32. 32.580 decreased by 15% =
33. 33.340 increased by 40% =
34. 34.130 increased by 10% =
35. 35.390 increased by 20% =
36. 36.316 decreased by 75% =
37. 37.60 increased by 15% =
38. 38.740 increased by 10% =
39. 39.40 increased by 30% =
40. 40.375 decreased by 12% =

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