Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 586 · 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. 1.648 decreased by 75% =
2. 2.780 increased by 25% =
3. 3.430 increased by 30% =
4. 4.680 increased by 40% =
5. 5.404 increased by 25% =
6. 6.610 decreased by 30% =
7. 7.800 decreased by 8% =
8. 8.240 increased by 15% =
9. 9.650 decreased by 60% =
10. 10.296 decreased by 50% =
11. 11.368 increased by 50% =
12. 12.800 increased by 30% =
13. 13.220 increased by 20% =
14. 14.440 increased by 50% =
15. 15.700 increased by 60% =
16. 16.310 decreased by 20% =
17. 17.115 increased by 40% =
18. 18.340 decreased by 10% =
19. 19.40 increased by 15% =
20. 20.600 increased by 8% =
21. 21.180 increased by 15% =
22. 22.780 decreased by 30% =
23. 23.320 decreased by 15% =
24. 24.630 decreased by 60% =
25. 25.120 increased by 30% =
26. 26.325 decreased by 60% =
27. 27.495 increased by 40% =
28. 28.750 decreased by 8% =
29. 29.40 increased by 15% =
30. 30.280 decreased by 35% =
31. 31.60 increased by 10% =
32. 32.510 increased by 40% =
33. 33.190 increased by 10% =
34. 34.120 decreased by 30% =
35. 35.496 decreased by 50% =
36. 36.575 increased by 8% =
37. 37.192 increased by 25% =
38. 38.700 increased by 12% =
39. 39.590 increased by 20% =
40. 40.130 increased by 30% =

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