Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 870 · 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. 1.155 increased by 60% =
2. 2.350 increased by 8% =
3. 3.355 increased by 60% =
4. 4.325 decreased by 12% =
5. 5.570 increased by 30% =
6. 6.280 decreased by 15% =
7. 7.650 decreased by 8% =
8. 8.450 decreased by 12% =
9. 9.640 increased by 35% =
10. 10.580 increased by 35% =
11. 11.475 decreased by 12% =
12. 12.500 increased by 20% =
13. 13.200 increased by 8% =
14. 14.556 increased by 25% =
15. 15.340 decreased by 40% =
16. 16.700 increased by 12% =
17. 17.130 decreased by 10% =
18. 18.480 increased by 15% =
19. 19.615 increased by 60% =
20. 20.50 decreased by 8% =
21. 21.80 increased by 5% =
22. 22.735 increased by 20% =
23. 23.760 decreased by 10% =
24. 24.40 decreased by 20% =
25. 25.360 decreased by 5% =
26. 26.142 increased by 50% =
27. 27.40 increased by 5% =
28. 28.640 decreased by 35% =
29. 29.340 decreased by 30% =
30. 30.350 increased by 10% =
31. 31.348 decreased by 75% =
32. 32.580 decreased by 5% =
33. 33.400 increased by 20% =
34. 34.68 increased by 25% =
35. 35.80 decreased by 35% =
36. 36.330 increased by 40% =
37. 37.615 increased by 60% =
38. 38.612 decreased by 75% =
39. 39.444 increased by 25% =
40. 40.220 decreased by 50% =

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