Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 155 · 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. 1.675 increased by 20% =
2. 2.455 decreased by 60% =
3. 3.265 increased by 20% =
4. 4.220 decreased by 5% =
5. 5.525 increased by 8% =
6. 6.160 decreased by 30% =
7. 7.380 decreased by 15% =
8. 8.400 decreased by 15% =
9. 9.625 increased by 12% =
10. 10.260 increased by 15% =
11. 11.780 increased by 30% =
12. 12.130 decreased by 10% =
13. 13.55 decreased by 40% =
14. 14.590 increased by 10% =
15. 15.615 increased by 20% =
16. 16.65 increased by 20% =
17. 17.50 decreased by 12% =
18. 18.230 increased by 20% =
19. 19.364 decreased by 25% =
20. 20.60 increased by 15% =
21. 21.425 increased by 12% =
22. 22.736 increased by 75% =
23. 23.400 increased by 8% =
24. 24.360 increased by 50% =
25. 25.260 decreased by 15% =
26. 26.320 decreased by 35% =
27. 27.205 decreased by 60% =
28. 28.350 increased by 12% =
29. 29.735 decreased by 20% =
30. 30.480 decreased by 40% =
31. 31.520 decreased by 60% =
32. 32.255 decreased by 60% =
33. 33.495 decreased by 40% =
34. 34.60 increased by 15% =
35. 35.600 increased by 15% =
36. 36.520 increased by 15% =
37. 37.300 increased by 8% =
38. 38.285 increased by 60% =
39. 39.300 increased by 35% =
40. 40.596 decreased by 50% =

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