Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 261 · 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. 1.120 increased by 30% =
2. 2.775 decreased by 8% =
3. 3.145 increased by 40% =
4. 4.615 decreased by 40% =
5. 5.560 decreased by 20% =
6. 6.80 decreased by 35% =
7. 7.700 decreased by 15% =
8. 8.95 increased by 20% =
9. 9.722 increased by 50% =
10. 10.340 increased by 15% =
11. 11.174 increased by 50% =
12. 12.440 increased by 5% =
13. 13.740 decreased by 15% =
14. 14.700 increased by 60% =
15. 15.540 increased by 15% =
16. 16.450 increased by 8% =
17. 17.368 increased by 25% =
18. 18.550 increased by 8% =
19. 19.240 decreased by 10% =
20. 20.70 decreased by 30% =
21. 21.360 decreased by 5% =
22. 22.250 increased by 12% =
23. 23.190 decreased by 10% =
24. 24.408 increased by 75% =
25. 25.556 decreased by 50% =
26. 26.520 decreased by 15% =
27. 27.675 increased by 40% =
28. 28.650 increased by 10% =
29. 29.464 increased by 75% =
30. 30.550 increased by 12% =
31. 31.700 decreased by 10% =
32. 32.590 decreased by 20% =
33. 33.280 decreased by 5% =
34. 34.200 increased by 35% =
35. 35.160 increased by 35% =
36. 36.200 decreased by 50% =
37. 37.60 increased by 5% =
38. 38.560 decreased by 40% =
39. 39.740 decreased by 15% =
40. 40.240 increased by 30% =

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