Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 170 · 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. 1.740 decreased by 35% =
2. 2.80 decreased by 35% =
3. 3.800 increased by 35% =
4. 4.340 decreased by 35% =
5. 5.490 increased by 60% =
6. 6.150 increased by 12% =
7. 7.385 decreased by 20% =
8. 8.100 decreased by 30% =
9. 9.376 increased by 75% =
10. 10.375 increased by 8% =
11. 11.440 increased by 5% =
12. 12.225 decreased by 8% =
13. 13.316 decreased by 50% =
14. 14.350 increased by 30% =
15. 15.300 decreased by 10% =
16. 16.140 increased by 10% =
17. 17.40 decreased by 10% =
18. 18.670 decreased by 10% =
19. 19.275 decreased by 40% =
20. 20.790 decreased by 20% =
21. 21.315 increased by 40% =
22. 22.40 increased by 10% =
23. 23.475 decreased by 12% =
24. 24.490 decreased by 10% =
25. 25.160 increased by 35% =
26. 26.575 increased by 12% =
27. 27.420 decreased by 15% =
28. 28.100 decreased by 8% =
29. 29.100 decreased by 35% =
30. 30.592 decreased by 25% =
31. 31.440 decreased by 10% =
32. 32.350 increased by 8% =
33. 33.510 increased by 10% =
34. 34.672 decreased by 50% =
35. 35.375 increased by 20% =
36. 36.40 decreased by 35% =
37. 37.380 decreased by 5% =
38. 38.520 increased by 15% =
39. 39.520 increased by 15% =
40. 40.90 increased by 40% =

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