Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 830 · 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. 1.200 decreased by 35% =
2. 2.640 increased by 15% =
3. 3.475 increased by 12% =
4. 4.398 increased by 50% =
5. 5.560 decreased by 10% =
6. 6.380 decreased by 5% =
7. 7.580 increased by 5% =
8. 8.280 increased by 5% =
9. 9.312 decreased by 25% =
10. 10.535 decreased by 40% =
11. 11.640 increased by 35% =
12. 12.220 decreased by 35% =
13. 13.200 increased by 5% =
14. 14.478 increased by 50% =
15. 15.208 increased by 50% =
16. 16.280 increased by 5% =
17. 17.635 increased by 20% =
18. 18.364 increased by 25% =
19. 19.190 increased by 30% =
20. 20.376 decreased by 25% =
21. 21.560 increased by 5% =
22. 22.480 increased by 20% =
23. 23.275 decreased by 8% =
24. 24.220 increased by 10% =
25. 25.290 increased by 10% =
26. 26.40 decreased by 35% =
27. 27.780 increased by 5% =
28. 28.364 decreased by 75% =
29. 29.140 increased by 15% =
30. 30.380 increased by 30% =
31. 31.40 increased by 20% =
32. 32.440 increased by 5% =
33. 33.360 decreased by 30% =
34. 34.710 increased by 20% =
35. 35.440 increased by 60% =
36. 36.40 increased by 35% =
37. 37.450 increased by 12% =
38. 38.655 decreased by 40% =
39. 39.628 increased by 50% =
40. 40.270 increased by 10% =

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