Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 404 · 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. 1.584 increased by 75% =
2. 2.575 decreased by 12% =
3. 3.60 increased by 15% =
4. 4.565 increased by 40% =
5. 5.650 increased by 8% =
6. 6.800 decreased by 8% =
7. 7.100 decreased by 35% =
8. 8.400 increased by 8% =
9. 9.775 decreased by 8% =
10. 10.620 decreased by 35% =
11. 11.650 decreased by 10% =
12. 12.550 decreased by 8% =
13. 13.170 increased by 30% =
14. 14.575 decreased by 12% =
15. 15.695 decreased by 60% =
16. 16.400 increased by 5% =
17. 17.140 increased by 10% =
18. 18.580 increased by 60% =
19. 19.285 decreased by 60% =
20. 20.660 decreased by 5% =
21. 21.230 increased by 30% =
22. 22.340 increased by 40% =
23. 23.575 increased by 20% =
24. 24.350 decreased by 40% =
25. 25.570 increased by 40% =
26. 26.640 increased by 30% =
27. 27.648 decreased by 25% =
28. 28.600 increased by 10% =
29. 29.90 decreased by 40% =
30. 30.352 increased by 25% =
31. 31.460 increased by 5% =
32. 32.105 increased by 40% =
33. 33.152 increased by 75% =
34. 34.200 increased by 10% =
35. 35.550 increased by 12% =
36. 36.458 decreased by 50% =
37. 37.112 increased by 25% =
38. 38.760 increased by 30% =
39. 39.640 decreased by 35% =
40. 40.545 increased by 20% =

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