Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 500 · 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. 1.232 decreased by 75% =
2. 2.768 increased by 25% =
3. 3.460 increased by 40% =
4. 4.488 decreased by 25% =
5. 5.190 decreased by 20% =
6. 6.664 decreased by 50% =
7. 7.110 increased by 20% =
8. 8.435 increased by 20% =
9. 9.280 increased by 5% =
10. 10.120 increased by 5% =
11. 11.280 decreased by 5% =
12. 12.50 increased by 12% =
13. 13.400 increased by 25% =
14. 14.364 decreased by 75% =
15. 15.205 decreased by 20% =
16. 16.530 decreased by 40% =
17. 17.760 decreased by 15% =
18. 18.40 increased by 5% =
19. 19.405 increased by 40% =
20. 20.680 decreased by 50% =
21. 21.760 decreased by 5% =
22. 22.280 increased by 10% =
23. 23.550 increased by 40% =
24. 24.585 increased by 40% =
25. 25.575 decreased by 8% =
26. 26.680 decreased by 20% =
27. 27.250 decreased by 10% =
28. 28.465 increased by 40% =
29. 29.516 increased by 25% =
30. 30.455 increased by 20% =
31. 31.700 decreased by 8% =
32. 32.320 increased by 25% =
33. 33.284 decreased by 50% =
34. 34.600 decreased by 35% =
35. 35.245 increased by 20% =
36. 36.240 increased by 60% =
37. 37.250 increased by 8% =
38. 38.450 decreased by 10% =
39. 39.730 increased by 10% =
40. 40.212 decreased by 75% =

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