Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 101 · 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. 1.660 decreased by 30% =
2. 2.725 decreased by 8% =
3. 3.140 decreased by 20% =
4. 4.480 increased by 50% =
5. 5.660 decreased by 15% =
6. 6.700 increased by 60% =
7. 7.576 increased by 75% =
8. 8.445 decreased by 60% =
9. 9.500 increased by 12% =
10. 10.170 decreased by 60% =
11. 11.396 increased by 25% =
12. 12.108 increased by 25% =
13. 13.475 decreased by 60% =
14. 14.680 decreased by 35% =
15. 15.132 increased by 25% =
16. 16.512 decreased by 25% =
17. 17.280 increased by 15% =
18. 18.800 increased by 60% =
19. 19.720 increased by 10% =
20. 20.450 increased by 8% =
21. 21.206 increased by 50% =
22. 22.175 increased by 12% =
23. 23.70 increased by 30% =
24. 24.780 increased by 15% =
25. 25.685 increased by 40% =
26. 26.660 decreased by 5% =
27. 27.525 decreased by 8% =
28. 28.130 increased by 30% =
29. 29.60 decreased by 5% =
30. 30.160 increased by 60% =
31. 31.120 increased by 15% =
32. 32.75 decreased by 12% =
33. 33.680 decreased by 35% =
34. 34.588 increased by 25% =
35. 35.646 increased by 50% =
36. 36.492 decreased by 75% =
37. 37.470 increased by 40% =
38. 38.424 increased by 75% =
39. 39.685 decreased by 40% =
40. 40.580 decreased by 10% =

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