Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 499 · 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. 1.780 decreased by 35% =
2. 2.600 decreased by 5% =
3. 3.40 decreased by 35% =
4. 4.60 decreased by 10% =
5. 5.675 increased by 12% =
6. 6.385 increased by 20% =
7. 7.605 decreased by 20% =
8. 8.140 decreased by 35% =
9. 9.424 increased by 75% =
10. 10.250 increased by 12% =
11. 11.560 increased by 35% =
12. 12.670 decreased by 20% =
13. 13.430 increased by 20% =
14. 14.750 increased by 12% =
15. 15.606 decreased by 50% =
16. 16.535 decreased by 60% =
17. 17.240 decreased by 15% =
18. 18.310 decreased by 10% =
19. 19.700 increased by 15% =
20. 20.676 increased by 75% =
21. 21.264 decreased by 75% =
22. 22.625 decreased by 8% =
23. 23.40 increased by 5% =
24. 24.128 decreased by 25% =
25. 25.200 increased by 35% =
26. 26.140 increased by 5% =
27. 27.745 increased by 60% =
28. 28.425 increased by 8% =
29. 29.600 increased by 40% =
30. 30.200 increased by 30% =
31. 31.504 decreased by 25% =
32. 32.560 decreased by 15% =
33. 33.550 increased by 12% =
34. 34.200 increased by 8% =
35. 35.75 increased by 40% =
36. 36.775 decreased by 8% =
37. 37.736 decreased by 50% =
38. 38.525 increased by 20% =
39. 39.625 increased by 8% =
40. 40.470 increased by 30% =

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