Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 358 · 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. 1.502 increased by 50% =
2. 2.755 decreased by 60% =
3. 3.500 decreased by 35% =
4. 4.280 decreased by 10% =
5. 5.120 increased by 20% =
6. 6.250 decreased by 12% =
7. 7.350 decreased by 30% =
8. 8.750 decreased by 12% =
9. 9.340 increased by 15% =
10. 10.225 decreased by 20% =
11. 11.636 increased by 75% =
12. 12.190 decreased by 30% =
13. 13.345 decreased by 60% =
14. 14.200 increased by 60% =
15. 15.650 increased by 8% =
16. 16.620 increased by 50% =
17. 17.550 increased by 30% =
18. 18.605 decreased by 60% =
19. 19.580 increased by 15% =
20. 20.175 decreased by 8% =
21. 21.520 decreased by 25% =
22. 22.480 increased by 5% =
23. 23.760 decreased by 15% =
24. 24.40 increased by 5% =
25. 25.520 increased by 60% =
26. 26.300 increased by 60% =
27. 27.480 decreased by 60% =
28. 28.48 increased by 75% =
29. 29.570 increased by 30% =
30. 30.120 decreased by 15% =
31. 31.730 decreased by 10% =
32. 32.320 increased by 10% =
33. 33.528 increased by 75% =
34. 34.140 increased by 10% =
35. 35.220 decreased by 15% =
36. 36.260 increased by 35% =
37. 37.552 increased by 25% =
38. 38.725 increased by 40% =
39. 39.620 increased by 5% =
40. 40.684 decreased by 75% =

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