Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 356 · 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. 1.630 decreased by 60% =
2. 2.150 increased by 10% =
3. 3.350 increased by 30% =
4. 4.155 decreased by 60% =
5. 5.570 increased by 10% =
6. 6.440 decreased by 10% =
7. 7.140 decreased by 10% =
8. 8.325 decreased by 12% =
9. 9.560 decreased by 10% =
10. 10.740 decreased by 20% =
11. 11.140 decreased by 15% =
12. 12.590 increased by 10% =
13. 13.580 decreased by 15% =
14. 14.440 decreased by 5% =
15. 15.155 increased by 60% =
16. 16.800 increased by 75% =
17. 17.155 increased by 40% =
18. 18.330 decreased by 40% =
19. 19.400 increased by 5% =
20. 20.695 decreased by 60% =
21. 21.300 decreased by 10% =
22. 22.40 increased by 5% =
23. 23.630 increased by 30% =
24. 24.360 increased by 35% =
25. 25.135 decreased by 40% =
26. 26.275 decreased by 20% =
27. 27.332 decreased by 50% =
28. 28.160 decreased by 40% =
29. 29.314 increased by 50% =
30. 30.692 increased by 50% =
31. 31.415 increased by 20% =
32. 32.768 increased by 75% =
33. 33.230 decreased by 10% =
34. 34.580 decreased by 10% =
35. 35.300 decreased by 8% =
36. 36.380 increased by 50% =
37. 37.760 decreased by 35% =
38. 38.360 increased by 35% =
39. 39.610 increased by 20% =
40. 40.340 decreased by 10% =

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