Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 688 · 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. 1.48 decreased by 75% =
2. 2.780 decreased by 25% =
3. 3.550 decreased by 10% =
4. 4.170 increased by 30% =
5. 5.620 decreased by 15% =
6. 6.492 increased by 25% =
7. 7.210 increased by 30% =
8. 8.220 increased by 35% =
9. 9.520 increased by 15% =
10. 10.80 decreased by 10% =
11. 11.150 decreased by 40% =
12. 12.660 increased by 5% =
13. 13.160 increased by 15% =
14. 14.338 decreased by 50% =
15. 15.300 increased by 35% =
16. 16.780 increased by 20% =
17. 17.556 increased by 50% =
18. 18.635 decreased by 20% =
19. 19.60 decreased by 35% =
20. 20.490 decreased by 40% =
21. 21.520 increased by 50% =
22. 22.404 increased by 75% =
23. 23.245 increased by 60% =
24. 24.760 increased by 20% =
25. 25.220 increased by 15% =
26. 26.240 increased by 35% =
27. 27.270 increased by 20% =
28. 28.475 decreased by 8% =
29. 29.732 decreased by 75% =
30. 30.770 decreased by 10% =
31. 31.375 decreased by 12% =
32. 32.575 decreased by 8% =
33. 33.100 decreased by 35% =
34. 34.280 increased by 5% =
35. 35.60 increased by 60% =
36. 36.66 increased by 50% =
37. 37.545 increased by 60% =
38. 38.112 increased by 75% =
39. 39.540 increased by 5% =
40. 40.230 decreased by 60% =

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