Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 924 · 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. 1.80 decreased by 35% =
2. 2.160 decreased by 10% =
3. 3.600 decreased by 15% =
4. 4.120 increased by 20% =
5. 5.730 increased by 30% =
6. 6.70 increased by 60% =
7. 7.645 decreased by 40% =
8. 8.285 increased by 40% =
9. 9.324 increased by 75% =
10. 10.190 increased by 30% =
11. 11.620 decreased by 10% =
12. 12.420 increased by 35% =
13. 13.310 decreased by 40% =
14. 14.132 decreased by 75% =
15. 15.436 increased by 75% =
16. 16.150 increased by 30% =
17. 17.200 increased by 15% =
18. 18.775 increased by 12% =
19. 19.585 decreased by 60% =
20. 20.340 increased by 35% =
21. 21.300 decreased by 8% =
22. 22.476 increased by 25% =
23. 23.196 increased by 25% =
24. 24.500 increased by 12% =
25. 25.40 decreased by 35% =
26. 26.705 decreased by 40% =
27. 27.265 increased by 40% =
28. 28.400 decreased by 20% =
29. 29.550 decreased by 10% =
30. 30.335 decreased by 40% =
31. 31.180 decreased by 35% =
32. 32.260 decreased by 5% =
33. 33.380 decreased by 35% =
34. 34.620 increased by 5% =
35. 35.90 decreased by 60% =
36. 36.265 increased by 20% =
37. 37.420 increased by 15% =
38. 38.800 increased by 30% =
39. 39.434 increased by 50% =
40. 40.80 decreased by 60% =

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