Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 136 · 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. 1.266 decreased by 50% =
2. 2.496 decreased by 25% =
3. 3.60 increased by 5% =
4. 4.260 decreased by 60% =
5. 5.300 increased by 5% =
6. 6.108 increased by 50% =
7. 7.460 increased by 30% =
8. 8.800 increased by 20% =
9. 9.600 decreased by 10% =
10. 10.420 increased by 35% =
11. 11.698 decreased by 50% =
12. 12.600 increased by 12% =
13. 13.790 increased by 10% =
14. 14.560 decreased by 40% =
15. 15.242 decreased by 50% =
16. 16.180 increased by 5% =
17. 17.320 increased by 5% =
18. 18.796 decreased by 75% =
19. 19.650 decreased by 50% =
20. 20.665 increased by 20% =
21. 21.740 increased by 5% =
22. 22.650 increased by 8% =
23. 23.300 decreased by 5% =
24. 24.588 decreased by 50% =
25. 25.565 increased by 20% =
26. 26.60 increased by 10% =
27. 27.80 increased by 30% =
28. 28.240 decreased by 10% =
29. 29.695 increased by 20% =
30. 30.275 increased by 12% =
31. 31.480 increased by 15% =
32. 32.260 decreased by 35% =
33. 33.800 increased by 10% =
34. 34.575 increased by 12% =
35. 35.660 decreased by 35% =
36. 36.792 decreased by 75% =
37. 37.800 decreased by 12% =
38. 38.85 decreased by 40% =
39. 39.800 decreased by 8% =
40. 40.760 decreased by 15% =

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