Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 31 · 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. 1.760 decreased by 5% =
2. 2.516 decreased by 25% =
3. 3.790 increased by 10% =
4. 4.430 increased by 30% =
5. 5.535 increased by 60% =
6. 6.185 increased by 20% =
7. 7.780 decreased by 15% =
8. 8.724 increased by 50% =
9. 9.398 decreased by 50% =
10. 10.455 decreased by 60% =
11. 11.680 decreased by 5% =
12. 12.420 decreased by 10% =
13. 13.500 decreased by 15% =
14. 14.200 decreased by 30% =
15. 15.430 increased by 10% =
16. 16.644 increased by 75% =
17. 17.320 decreased by 75% =
18. 18.740 decreased by 5% =
19. 19.340 increased by 25% =
20. 20.760 increased by 15% =
21. 21.490 increased by 10% =
22. 22.335 increased by 20% =
23. 23.300 increased by 35% =
24. 24.140 increased by 10% =
25. 25.670 decreased by 30% =
26. 26.190 increased by 10% =
27. 27.60 decreased by 30% =
28. 28.632 decreased by 25% =
29. 29.120 increased by 35% =
30. 30.200 decreased by 5% =
31. 31.400 increased by 15% =
32. 32.460 increased by 60% =
33. 33.525 decreased by 12% =
34. 34.278 decreased by 50% =
35. 35.440 increased by 10% =
36. 36.85 decreased by 60% =
37. 37.145 decreased by 40% =
38. 38.794 increased by 50% =
39. 39.160 decreased by 25% =
40. 40.130 decreased by 30% =

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