Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 505 · 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. 1.620 decreased by 10% =
2. 2.420 decreased by 15% =
3. 3.700 decreased by 35% =
4. 4.104 increased by 75% =
5. 5.650 decreased by 10% =
6. 6.375 increased by 12% =
7. 7.235 increased by 20% =
8. 8.418 decreased by 50% =
9. 9.300 increased by 10% =
10. 10.152 increased by 75% =
11. 11.370 decreased by 30% =
12. 12.325 increased by 12% =
13. 13.525 decreased by 12% =
14. 14.100 decreased by 35% =
15. 15.120 decreased by 5% =
16. 16.632 decreased by 25% =
17. 17.780 increased by 5% =
18. 18.290 decreased by 40% =
19. 19.528 decreased by 25% =
20. 20.580 increased by 35% =
21. 21.100 decreased by 35% =
22. 22.330 decreased by 30% =
23. 23.500 decreased by 40% =
24. 24.380 increased by 15% =
25. 25.340 increased by 15% =
26. 26.140 increased by 30% =
27. 27.480 increased by 35% =
28. 28.700 increased by 35% =
29. 29.300 decreased by 8% =
30. 30.680 decreased by 5% =
31. 31.740 increased by 15% =
32. 32.75 increased by 8% =
33. 33.140 decreased by 35% =
34. 34.140 increased by 5% =
35. 35.485 decreased by 60% =
36. 36.100 increased by 15% =
37. 37.180 increased by 25% =
38. 38.380 increased by 5% =
39. 39.105 increased by 60% =
40. 40.210 increased by 10% =

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