Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 375 · 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. 1.64 increased by 75% =
2. 2.610 increased by 60% =
3. 3.250 decreased by 20% =
4. 4.575 increased by 8% =
5. 5.600 increased by 8% =
6. 6.40 decreased by 10% =
7. 7.700 decreased by 35% =
8. 8.556 decreased by 50% =
9. 9.552 increased by 25% =
10. 10.460 decreased by 30% =
11. 11.300 decreased by 12% =
12. 12.550 increased by 12% =
13. 13.780 decreased by 5% =
14. 14.776 decreased by 25% =
15. 15.195 decreased by 20% =
16. 16.220 decreased by 10% =
17. 17.800 decreased by 12% =
18. 18.716 decreased by 50% =
19. 19.525 increased by 8% =
20. 20.470 decreased by 10% =
21. 21.50 increased by 12% =
22. 22.325 increased by 12% =
23. 23.418 decreased by 50% =
24. 24.320 increased by 10% =
25. 25.420 increased by 35% =
26. 26.280 increased by 30% =
27. 27.342 increased by 50% =
28. 28.624 decreased by 75% =
29. 29.536 increased by 25% =
30. 30.270 increased by 30% =
31. 31.124 increased by 25% =
32. 32.308 increased by 75% =
33. 33.40 decreased by 10% =
34. 34.610 increased by 50% =
35. 35.558 decreased by 50% =
36. 36.40 decreased by 35% =
37. 37.400 decreased by 15% =
38. 38.668 decreased by 75% =
39. 39.610 increased by 60% =
40. 40.762 increased by 50% =

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