Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 739 · 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. 1.735 decreased by 20% =
2. 2.250 decreased by 8% =
3. 3.155 decreased by 60% =
4. 4.520 decreased by 35% =
5. 5.390 increased by 30% =
6. 6.180 increased by 5% =
7. 7.596 decreased by 50% =
8. 8.316 decreased by 50% =
9. 9.400 decreased by 8% =
10. 10.400 increased by 10% =
11. 11.310 increased by 50% =
12. 12.688 increased by 75% =
13. 13.480 increased by 15% =
14. 14.500 decreased by 15% =
15. 15.770 decreased by 40% =
16. 16.630 increased by 10% =
17. 17.360 decreased by 15% =
18. 18.125 decreased by 8% =
19. 19.260 decreased by 50% =
20. 20.664 decreased by 25% =
21. 21.392 increased by 50% =
22. 22.540 increased by 75% =
23. 23.508 increased by 75% =
24. 24.580 increased by 30% =
25. 25.650 decreased by 12% =
26. 26.375 decreased by 8% =
27. 27.725 increased by 8% =
28. 28.590 increased by 10% =
29. 29.125 increased by 8% =
30. 30.640 decreased by 10% =
31. 31.375 decreased by 8% =
32. 32.200 increased by 35% =
33. 33.630 increased by 60% =
34. 34.280 increased by 35% =
35. 35.475 increased by 40% =
36. 36.90 decreased by 60% =
37. 37.260 decreased by 30% =
38. 38.200 decreased by 5% =
39. 39.540 increased by 15% =
40. 40.230 decreased by 10% =

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