Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 455 · 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. 1.150 decreased by 12% =
2. 2.770 decreased by 30% =
3. 3.460 decreased by 35% =
4. 4.75 increased by 8% =
5. 5.660 increased by 15% =
6. 6.604 increased by 50% =
7. 7.580 decreased by 5% =
8. 8.588 increased by 50% =
9. 9.544 decreased by 50% =
10. 10.470 increased by 20% =
11. 11.375 increased by 12% =
12. 12.420 decreased by 5% =
13. 13.512 increased by 25% =
14. 14.210 increased by 10% =
15. 15.570 increased by 30% =
16. 16.760 increased by 15% =
17. 17.300 decreased by 15% =
18. 18.100 increased by 5% =
19. 19.260 decreased by 35% =
20. 20.750 increased by 30% =
21. 21.370 decreased by 30% =
22. 22.750 increased by 8% =
23. 23.665 decreased by 20% =
24. 24.255 decreased by 40% =
25. 25.150 decreased by 12% =
26. 26.380 decreased by 35% =
27. 27.795 decreased by 40% =
28. 28.480 decreased by 20% =
29. 29.140 decreased by 20% =
30. 30.600 increased by 8% =
31. 31.590 increased by 10% =
32. 32.458 decreased by 50% =
33. 33.325 increased by 8% =
34. 34.480 increased by 35% =
35. 35.510 increased by 30% =
36. 36.160 decreased by 35% =
37. 37.254 decreased by 50% =
38. 38.600 decreased by 5% =
39. 39.500 decreased by 12% =
40. 40.760 increased by 35% =

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