Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 977 · 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. 1.60 increased by 5% =
2. 2.220 decreased by 10% =
3. 3.420 decreased by 15% =
4. 4.625 decreased by 8% =
5. 5.700 decreased by 10% =
6. 6.480 increased by 15% =
7. 7.400 increased by 8% =
8. 8.730 increased by 40% =
9. 9.130 decreased by 40% =
10. 10.320 increased by 35% =
11. 11.445 decreased by 20% =
12. 12.108 increased by 25% =
13. 13.700 decreased by 10% =
14. 14.800 increased by 5% =
15. 15.720 decreased by 20% =
16. 16.380 decreased by 60% =
17. 17.48 increased by 50% =
18. 18.370 increased by 10% =
19. 19.125 increased by 8% =
20. 20.775 decreased by 12% =
21. 21.465 increased by 60% =
22. 22.250 increased by 12% =
23. 23.768 decreased by 25% =
24. 24.252 increased by 50% =
25. 25.725 decreased by 8% =
26. 26.360 decreased by 5% =
27. 27.200 decreased by 8% =
28. 28.400 decreased by 5% =
29. 29.720 decreased by 10% =
30. 30.305 increased by 40% =
31. 31.240 increased by 10% =
32. 32.600 increased by 5% =
33. 33.440 decreased by 5% =
34. 34.300 decreased by 35% =
35. 35.634 increased by 50% =
36. 36.650 increased by 40% =
37. 37.460 decreased by 10% =
38. 38.180 increased by 5% =
39. 39.660 decreased by 15% =
40. 40.148 decreased by 25% =

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