Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 685 · 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. 1.620 increased by 20% =
2. 2.180 increased by 40% =
3. 3.150 decreased by 8% =
4. 4.350 decreased by 12% =
5. 5.125 decreased by 8% =
6. 6.250 increased by 50% =
7. 7.790 increased by 30% =
8. 8.748 increased by 75% =
9. 9.645 increased by 60% =
10. 10.456 increased by 75% =
11. 11.636 decreased by 75% =
12. 12.65 increased by 20% =
13. 13.255 decreased by 20% =
14. 14.448 increased by 50% =
15. 15.168 decreased by 50% =
16. 16.548 decreased by 25% =
17. 17.240 decreased by 20% =
18. 18.698 increased by 50% =
19. 19.745 increased by 60% =
20. 20.684 decreased by 75% =
21. 21.60 decreased by 25% =
22. 22.600 decreased by 35% =
23. 23.332 increased by 50% =
24. 24.235 increased by 60% =
25. 25.180 increased by 5% =
26. 26.235 increased by 20% =
27. 27.220 increased by 35% =
28. 28.540 increased by 15% =
29. 29.180 increased by 5% =
30. 30.110 increased by 10% =
31. 31.396 increased by 75% =
32. 32.600 increased by 10% =
33. 33.88 decreased by 75% =
34. 34.600 increased by 8% =
35. 35.550 increased by 12% =
36. 36.462 increased by 50% =
37. 37.500 decreased by 8% =
38. 38.630 increased by 40% =
39. 39.720 decreased by 5% =
40. 40.520 increased by 5% =

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