Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 862 · 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. 1.205 decreased by 60% =
2. 2.330 decreased by 20% =
3. 3.510 increased by 20% =
4. 4.646 decreased by 50% =
5. 5.550 decreased by 12% =
6. 6.480 decreased by 15% =
7. 7.720 increased by 40% =
8. 8.380 increased by 5% =
9. 9.135 increased by 60% =
10. 10.530 decreased by 30% =
11. 11.800 increased by 15% =
12. 12.100 increased by 12% =
13. 13.432 increased by 75% =
14. 14.645 decreased by 60% =
15. 15.360 decreased by 30% =
16. 16.110 decreased by 20% =
17. 17.200 decreased by 60% =
18. 18.155 increased by 40% =
19. 19.604 decreased by 25% =
20. 20.444 decreased by 75% =
21. 21.400 decreased by 12% =
22. 22.524 increased by 25% =
23. 23.220 increased by 30% =
24. 24.572 increased by 25% =
25. 25.260 increased by 15% =
26. 26.800 increased by 20% =
27. 27.425 decreased by 12% =
28. 28.220 increased by 35% =
29. 29.260 increased by 5% =
30. 30.615 decreased by 20% =
31. 31.336 increased by 25% =
32. 32.650 increased by 12% =
33. 33.130 decreased by 30% =
34. 34.310 decreased by 20% =
35. 35.360 increased by 40% =
36. 36.750 decreased by 12% =
37. 37.325 decreased by 12% =
38. 38.252 increased by 75% =
39. 39.700 increased by 5% =
40. 40.750 increased by 20% =

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