Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 206 · 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. 1.224 increased by 75% =
2. 2.100 decreased by 5% =
3. 3.674 increased by 50% =
4. 4.320 decreased by 30% =
5. 5.472 increased by 25% =
6. 6.348 increased by 75% =
7. 7.325 increased by 8% =
8. 8.115 increased by 40% =
9. 9.560 decreased by 15% =
10. 10.475 decreased by 12% =
11. 11.800 decreased by 60% =
12. 12.130 increased by 10% =
13. 13.250 increased by 30% =
14. 14.175 increased by 8% =
15. 15.450 increased by 8% =
16. 16.788 decreased by 25% =
17. 17.140 increased by 30% =
18. 18.675 increased by 12% =
19. 19.420 increased by 60% =
20. 20.612 increased by 25% =
21. 21.528 decreased by 50% =
22. 22.475 increased by 20% =
23. 23.390 increased by 40% =
24. 24.200 decreased by 35% =
25. 25.700 decreased by 15% =
26. 26.640 increased by 20% =
27. 27.480 decreased by 20% =
28. 28.450 increased by 20% =
29. 29.620 decreased by 5% =
30. 30.625 increased by 8% =
31. 31.592 increased by 75% =
32. 32.230 increased by 60% =
33. 33.114 decreased by 50% =
34. 34.755 increased by 40% =
35. 35.340 decreased by 30% =
36. 36.160 increased by 15% =
37. 37.640 increased by 10% =
38. 38.675 increased by 8% =
39. 39.450 increased by 12% =
40. 40.520 increased by 35% =

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