Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 548 · 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. 1.220 decreased by 10% =
2. 2.520 increased by 5% =
3. 3.132 increased by 25% =
4. 4.710 increased by 30% =
5. 5.310 increased by 50% =
6. 6.730 decreased by 10% =
7. 7.250 increased by 8% =
8. 8.215 decreased by 60% =
9. 9.664 decreased by 50% =
10. 10.385 decreased by 20% =
11. 11.244 decreased by 75% =
12. 12.190 increased by 10% =
13. 13.120 increased by 5% =
14. 14.545 decreased by 40% =
15. 15.260 decreased by 35% =
16. 16.70 increased by 10% =
17. 17.660 decreased by 15% =
18. 18.364 decreased by 25% =
19. 19.205 decreased by 40% =
20. 20.775 increased by 60% =
21. 21.210 decreased by 10% =
22. 22.460 decreased by 15% =
23. 23.560 decreased by 5% =
24. 24.200 increased by 60% =
25. 25.570 decreased by 20% =
26. 26.40 decreased by 35% =
27. 27.740 decreased by 5% =
28. 28.320 increased by 40% =
29. 29.362 decreased by 50% =
30. 30.510 decreased by 20% =
31. 31.608 increased by 75% =
32. 32.375 increased by 12% =
33. 33.425 decreased by 8% =
34. 34.196 increased by 75% =
35. 35.540 decreased by 5% =
36. 36.725 increased by 12% =
37. 37.595 decreased by 20% =
38. 38.725 increased by 12% =
39. 39.565 increased by 20% =
40. 40.500 decreased by 5% =

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