Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 822 · 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. 1.350 increased by 12% =
2. 2.520 increased by 20% =
3. 3.760 decreased by 15% =
4. 4.250 increased by 50% =
5. 5.250 increased by 30% =
6. 6.184 increased by 75% =
7. 7.500 increased by 5% =
8. 8.88 increased by 25% =
9. 9.80 decreased by 50% =
10. 10.56 decreased by 75% =
11. 11.488 increased by 75% =
12. 12.400 decreased by 5% =
13. 13.550 increased by 10% =
14. 14.790 decreased by 60% =
15. 15.160 decreased by 30% =
16. 16.388 decreased by 25% =
17. 17.40 increased by 20% =
18. 18.736 increased by 25% =
19. 19.762 increased by 50% =
20. 20.228 decreased by 50% =
21. 21.530 increased by 30% =
22. 22.300 increased by 5% =
23. 23.480 increased by 15% =
24. 24.180 decreased by 25% =
25. 25.398 decreased by 50% =
26. 26.500 increased by 12% =
27. 27.276 decreased by 75% =
28. 28.240 decreased by 15% =
29. 29.425 increased by 12% =
30. 30.760 decreased by 5% =
31. 31.622 increased by 50% =
32. 32.160 increased by 15% =
33. 33.785 decreased by 20% =
34. 34.480 decreased by 35% =
35. 35.125 increased by 20% =
36. 36.108 increased by 75% =
37. 37.100 decreased by 8% =
38. 38.130 increased by 50% =
39. 39.218 decreased by 50% =
40. 40.230 increased by 60% =

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