Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 970 · 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 increased by 40% =
2. 2.652 increased by 50% =
3. 3.50 decreased by 12% =
4. 4.460 increased by 40% =
5. 5.770 increased by 20% =
6. 6.80 increased by 35% =
7. 7.620 increased by 10% =
8. 8.150 increased by 12% =
9. 9.220 increased by 15% =
10. 10.260 decreased by 15% =
11. 11.125 decreased by 8% =
12. 12.600 increased by 10% =
13. 13.475 decreased by 12% =
14. 14.692 decreased by 75% =
15. 15.180 decreased by 5% =
16. 16.682 increased by 50% =
17. 17.100 decreased by 5% =
18. 18.325 increased by 12% =
19. 19.280 increased by 25% =
20. 20.320 decreased by 15% =
21. 21.240 decreased by 75% =
22. 22.550 decreased by 12% =
23. 23.344 decreased by 50% =
24. 24.368 decreased by 50% =
25. 25.200 increased by 50% =
26. 26.350 increased by 12% =
27. 27.800 decreased by 8% =
28. 28.256 increased by 75% =
29. 29.50 increased by 12% =
30. 30.710 decreased by 30% =
31. 31.560 increased by 30% =
32. 32.588 decreased by 50% =
33. 33.772 decreased by 25% =
34. 34.140 increased by 15% =
35. 35.750 increased by 8% =
36. 36.398 increased by 50% =
37. 37.220 decreased by 30% =
38. 38.240 increased by 50% =
39. 39.240 decreased by 35% =
40. 40.140 increased by 5% =

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