Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 124 · 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. 1.255 decreased by 40% =
2. 2.88 increased by 25% =
3. 3.160 decreased by 5% =
4. 4.300 decreased by 8% =
5. 5.275 increased by 8% =
6. 6.50 increased by 30% =
7. 7.64 increased by 50% =
8. 8.700 increased by 5% =
9. 9.575 increased by 12% =
10. 10.140 increased by 20% =
11. 11.510 increased by 30% =
12. 12.190 decreased by 60% =
13. 13.740 increased by 35% =
14. 14.605 increased by 60% =
15. 15.80 increased by 20% =
16. 16.358 decreased by 50% =
17. 17.155 decreased by 20% =
18. 18.128 decreased by 75% =
19. 19.455 increased by 20% =
20. 20.390 decreased by 10% =
21. 21.175 decreased by 8% =
22. 22.640 increased by 30% =
23. 23.496 decreased by 75% =
24. 24.590 increased by 10% =
25. 25.240 increased by 35% =
26. 26.305 increased by 60% =
27. 27.88 increased by 25% =
28. 28.210 increased by 40% =
29. 29.210 decreased by 10% =
30. 30.475 increased by 12% =
31. 31.768 increased by 75% =
32. 32.450 increased by 10% =
33. 33.500 increased by 8% =
34. 34.475 increased by 12% =
35. 35.720 decreased by 15% =
36. 36.775 decreased by 20% =
37. 37.475 decreased by 20% =
38. 38.315 decreased by 20% =
39. 39.520 increased by 50% =
40. 40.640 increased by 30% =

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