Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 342 · 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. 1.340 decreased by 60% =
2. 2.214 increased by 50% =
3. 3.308 increased by 50% =
4. 4.560 decreased by 15% =
5. 5.120 decreased by 15% =
6. 6.760 increased by 15% =
7. 7.180 decreased by 5% =
8. 8.720 decreased by 5% =
9. 9.360 decreased by 75% =
10. 10.50 increased by 12% =
11. 11.720 decreased by 30% =
12. 12.245 decreased by 20% =
13. 13.440 increased by 40% =
14. 14.50 decreased by 8% =
15. 15.160 increased by 60% =
16. 16.400 decreased by 75% =
17. 17.160 increased by 5% =
18. 18.550 increased by 8% =
19. 19.230 decreased by 40% =
20. 20.450 increased by 8% =
21. 21.725 decreased by 8% =
22. 22.700 increased by 8% =
23. 23.360 decreased by 5% =
24. 24.325 decreased by 40% =
25. 25.140 decreased by 35% =
26. 26.450 increased by 12% =
27. 27.778 increased by 50% =
28. 28.150 increased by 8% =
29. 29.300 increased by 8% =
30. 30.280 increased by 40% =
31. 31.68 increased by 25% =
32. 32.450 increased by 10% =
33. 33.80 increased by 15% =
34. 34.700 increased by 10% =
35. 35.310 decreased by 30% =
36. 36.280 increased by 75% =
37. 37.136 increased by 50% =
38. 38.340 increased by 15% =
39. 39.120 increased by 5% =
40. 40.465 increased by 40% =

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