Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 249 · 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. 1.570 decreased by 10% =
2. 2.470 decreased by 30% =
3. 3.110 decreased by 50% =
4. 4.224 increased by 75% =
5. 5.750 decreased by 12% =
6. 6.620 decreased by 15% =
7. 7.660 increased by 30% =
8. 8.685 decreased by 40% =
9. 9.488 decreased by 75% =
10. 10.170 increased by 10% =
11. 11.125 increased by 20% =
12. 12.275 increased by 8% =
13. 13.400 increased by 12% =
14. 14.600 decreased by 5% =
15. 15.240 decreased by 15% =
16. 16.444 increased by 25% =
17. 17.620 decreased by 5% =
18. 18.260 decreased by 60% =
19. 19.580 increased by 35% =
20. 20.340 increased by 15% =
21. 21.340 increased by 5% =
22. 22.760 increased by 35% =
23. 23.40 decreased by 20% =
24. 24.596 decreased by 25% =
25. 25.125 decreased by 12% =
26. 26.40 decreased by 5% =
27. 27.452 increased by 75% =
28. 28.640 increased by 15% =
29. 29.380 decreased by 5% =
30. 30.420 increased by 15% =
31. 31.160 decreased by 35% =
32. 32.776 increased by 25% =
33. 33.665 increased by 60% =
34. 34.784 decreased by 75% =
35. 35.440 increased by 5% =
36. 36.420 decreased by 35% =
37. 37.550 decreased by 12% =
38. 38.420 decreased by 5% =
39. 39.712 decreased by 25% =
40. 40.455 increased by 60% =

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