Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 600 · 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. 1.100 increased by 12% =
2. 2.744 increased by 25% =
3. 3.90 increased by 30% =
4. 4.600 increased by 30% =
5. 5.760 decreased by 35% =
6. 6.630 increased by 10% =
7. 7.560 increased by 15% =
8. 8.220 decreased by 15% =
9. 9.188 increased by 25% =
10. 10.675 increased by 8% =
11. 11.265 decreased by 60% =
12. 12.75 increased by 8% =
13. 13.215 decreased by 60% =
14. 14.210 decreased by 10% =
15. 15.610 decreased by 10% =
16. 16.620 decreased by 30% =
17. 17.245 increased by 60% =
18. 18.660 increased by 5% =
19. 19.560 increased by 15% =
20. 20.296 decreased by 75% =
21. 21.620 increased by 35% =
22. 22.275 increased by 8% =
23. 23.228 increased by 25% =
24. 24.485 decreased by 20% =
25. 25.190 decreased by 20% =
26. 26.565 increased by 60% =
27. 27.120 increased by 5% =
28. 28.568 increased by 25% =
29. 29.520 decreased by 5% =
30. 30.575 increased by 40% =
31. 31.235 decreased by 60% =
32. 32.600 decreased by 35% =
33. 33.430 decreased by 10% =
34. 34.500 increased by 15% =
35. 35.50 decreased by 30% =
36. 36.640 increased by 20% =
37. 37.300 increased by 5% =
38. 38.260 increased by 35% =
39. 39.175 increased by 20% =
40. 40.140 decreased by 40% =

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