Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 601 · 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. 1.105 decreased by 60% =
2. 2.60 decreased by 20% =
3. 3.348 increased by 75% =
4. 4.680 increased by 5% =
5. 5.400 increased by 35% =
6. 6.400 decreased by 5% =
7. 7.80 increased by 40% =
8. 8.476 increased by 75% =
9. 9.620 increased by 15% =
10. 10.775 increased by 20% =
11. 11.480 increased by 15% =
12. 12.360 increased by 75% =
13. 13.280 increased by 30% =
14. 14.260 increased by 40% =
15. 15.360 increased by 35% =
16. 16.560 increased by 15% =
17. 17.455 decreased by 20% =
18. 18.450 increased by 10% =
19. 19.500 decreased by 10% =
20. 20.400 decreased by 5% =
21. 21.50 increased by 12% =
22. 22.560 decreased by 60% =
23. 23.300 decreased by 12% =
24. 24.420 increased by 35% =
25. 25.64 increased by 25% =
26. 26.492 increased by 75% =
27. 27.620 increased by 60% =
28. 28.250 decreased by 10% =
29. 29.364 decreased by 50% =
30. 30.350 decreased by 8% =
31. 31.180 increased by 20% =
32. 32.175 decreased by 12% =
33. 33.732 decreased by 75% =
34. 34.100 increased by 12% =
35. 35.325 increased by 60% =
36. 36.200 decreased by 35% =
37. 37.720 increased by 5% =
38. 38.285 increased by 20% =
39. 39.635 decreased by 60% =
40. 40.298 increased by 50% =

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