Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 330 · 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. 1.310 decreased by 10% =
2. 2.280 decreased by 75% =
3. 3.700 increased by 10% =
4. 4.200 increased by 75% =
5. 5.674 increased by 50% =
6. 6.560 increased by 35% =
7. 7.80 increased by 35% =
8. 8.660 decreased by 15% =
9. 9.200 decreased by 5% =
10. 10.600 increased by 25% =
11. 11.600 decreased by 12% =
12. 12.100 decreased by 12% =
13. 13.200 increased by 8% =
14. 14.700 increased by 15% =
15. 15.365 decreased by 60% =
16. 16.520 decreased by 35% =
17. 17.480 decreased by 30% =
18. 18.225 increased by 8% =
19. 19.370 increased by 40% =
20. 20.510 decreased by 30% =
21. 21.440 decreased by 40% =
22. 22.570 increased by 20% =
23. 23.550 increased by 10% =
24. 24.235 decreased by 40% =
25. 25.475 decreased by 12% =
26. 26.340 decreased by 5% =
27. 27.690 decreased by 40% =
28. 28.140 decreased by 25% =
29. 29.325 decreased by 20% =
30. 30.160 increased by 15% =
31. 31.60 decreased by 15% =
32. 32.250 increased by 10% =
33. 33.735 increased by 60% =
34. 34.475 increased by 12% =
35. 35.170 decreased by 20% =
36. 36.540 decreased by 60% =
37. 37.420 increased by 40% =
38. 38.394 increased by 50% =
39. 39.120 decreased by 5% =
40. 40.240 increased by 5% =

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