Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 848 · 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. 1.560 decreased by 5% =
2. 2.300 decreased by 20% =
3. 3.420 increased by 10% =
4. 4.615 decreased by 40% =
5. 5.40 decreased by 5% =
6. 6.230 decreased by 30% =
7. 7.175 decreased by 8% =
8. 8.400 increased by 15% =
9. 9.640 decreased by 35% =
10. 10.470 increased by 10% =
11. 11.660 increased by 10% =
12. 12.120 increased by 5% =
13. 13.800 decreased by 35% =
14. 14.520 decreased by 75% =
15. 15.140 increased by 15% =
16. 16.200 decreased by 30% =
17. 17.444 increased by 50% =
18. 18.600 increased by 5% =
19. 19.140 increased by 15% =
20. 20.128 decreased by 50% =
21. 21.120 decreased by 15% =
22. 22.310 increased by 60% =
23. 23.690 increased by 40% =
24. 24.248 increased by 75% =
25. 25.410 decreased by 20% =
26. 26.220 increased by 20% =
27. 27.135 increased by 40% =
28. 28.55 increased by 40% =
29. 29.340 increased by 5% =
30. 30.650 increased by 20% =
31. 31.210 decreased by 30% =
32. 32.295 decreased by 60% =
33. 33.180 increased by 15% =
34. 34.525 increased by 60% =
35. 35.190 decreased by 10% =
36. 36.325 increased by 8% =
37. 37.525 decreased by 8% =
38. 38.800 increased by 15% =
39. 39.150 increased by 10% =
40. 40.240 increased by 20% =

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