Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 827 · 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. 1.285 increased by 20% =
2. 2.595 increased by 60% =
3. 3.115 decreased by 60% =
4. 4.600 decreased by 5% =
5. 5.58 decreased by 50% =
6. 6.60 increased by 60% =
7. 7.506 decreased by 50% =
8. 8.612 increased by 25% =
9. 9.404 increased by 25% =
10. 10.100 decreased by 15% =
11. 11.180 decreased by 10% =
12. 12.175 decreased by 12% =
13. 13.715 increased by 20% =
14. 14.125 decreased by 8% =
15. 15.300 increased by 30% =
16. 16.360 decreased by 5% =
17. 17.780 increased by 30% =
18. 18.80 decreased by 15% =
19. 19.680 decreased by 5% =
20. 20.370 decreased by 60% =
21. 21.540 decreased by 20% =
22. 22.170 decreased by 30% =
23. 23.60 increased by 30% =
24. 24.170 increased by 40% =
25. 25.396 increased by 75% =
26. 26.508 decreased by 25% =
27. 27.640 decreased by 5% =
28. 28.220 increased by 15% =
29. 29.480 increased by 30% =
30. 30.560 decreased by 10% =
31. 31.250 increased by 30% =
32. 32.600 decreased by 30% =
33. 33.425 increased by 60% =
34. 34.575 increased by 8% =
35. 35.680 increased by 35% =
36. 36.320 decreased by 30% =
37. 37.700 decreased by 30% =
38. 38.700 increased by 35% =
39. 39.168 decreased by 25% =
40. 40.260 increased by 10% =

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