Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 896 · 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. 1.430 decreased by 10% =
2. 2.220 increased by 15% =
3. 3.60 decreased by 5% =
4. 4.770 increased by 20% =
5. 5.500 increased by 40% =
6. 6.716 decreased by 50% =
7. 7.158 decreased by 50% =
8. 8.96 decreased by 25% =
9. 9.140 increased by 10% =
10. 10.796 decreased by 25% =
11. 11.100 decreased by 40% =
12. 12.50 increased by 40% =
13. 13.56 increased by 25% =
14. 14.60 decreased by 60% =
15. 15.705 decreased by 40% =
16. 16.70 increased by 30% =
17. 17.796 decreased by 75% =
18. 18.460 increased by 35% =
19. 19.225 decreased by 60% =
20. 20.420 increased by 15% =
21. 21.80 decreased by 15% =
22. 22.48 decreased by 50% =
23. 23.775 decreased by 12% =
24. 24.220 increased by 15% =
25. 25.534 increased by 50% =
26. 26.240 decreased by 35% =
27. 27.540 increased by 60% =
28. 28.725 increased by 8% =
29. 29.660 increased by 35% =
30. 30.650 increased by 8% =
31. 31.500 increased by 12% =
32. 32.725 increased by 60% =
33. 33.275 increased by 12% =
34. 34.140 increased by 15% =
35. 35.245 decreased by 20% =
36. 36.440 decreased by 35% =
37. 37.416 increased by 25% =
38. 38.70 decreased by 30% =
39. 39.575 increased by 60% =
40. 40.285 decreased by 40% =

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