Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 796 · 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 decreased by 40% =
2. 2.155 increased by 40% =
3. 3.585 decreased by 60% =
4. 4.520 decreased by 30% =
5. 5.380 increased by 40% =
6. 6.720 decreased by 10% =
7. 7.40 decreased by 15% =
8. 8.90 increased by 30% =
9. 9.85 increased by 20% =
10. 10.595 increased by 20% =
11. 11.370 decreased by 30% =
12. 12.600 increased by 12% =
13. 13.800 increased by 8% =
14. 14.330 decreased by 10% =
15. 15.172 decreased by 25% =
16. 16.225 increased by 12% =
17. 17.256 increased by 75% =
18. 18.284 increased by 50% =
19. 19.200 decreased by 12% =
20. 20.550 decreased by 8% =
21. 21.460 decreased by 25% =
22. 22.240 decreased by 30% =
23. 23.500 decreased by 15% =
24. 24.258 decreased by 50% =
25. 25.440 decreased by 50% =
26. 26.600 increased by 5% =
27. 27.500 increased by 35% =
28. 28.305 increased by 60% =
29. 29.430 decreased by 10% =
30. 30.100 decreased by 8% =
31. 31.160 decreased by 5% =
32. 32.300 decreased by 8% =
33. 33.520 increased by 5% =
34. 34.400 decreased by 5% =
35. 35.650 decreased by 8% =
36. 36.260 decreased by 75% =
37. 37.500 decreased by 20% =
38. 38.676 decreased by 75% =
39. 39.270 increased by 10% =
40. 40.144 increased by 50% =

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