Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 373 · 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. 1.540 decreased by 5% =
2. 2.420 decreased by 15% =
3. 3.580 decreased by 5% =
4. 4.110 decreased by 30% =
5. 5.360 decreased by 5% =
6. 6.104 decreased by 75% =
7. 7.380 decreased by 10% =
8. 8.704 decreased by 50% =
9. 9.540 decreased by 60% =
10. 10.280 decreased by 35% =
11. 11.800 increased by 12% =
12. 12.600 increased by 8% =
13. 13.450 increased by 40% =
14. 14.375 increased by 8% =
15. 15.440 increased by 15% =
16. 16.592 increased by 75% =
17. 17.440 decreased by 5% =
18. 18.220 decreased by 5% =
19. 19.440 increased by 5% =
20. 20.100 decreased by 8% =
21. 21.325 decreased by 8% =
22. 22.500 decreased by 15% =
23. 23.224 decreased by 25% =
24. 24.610 decreased by 60% =
25. 25.560 increased by 40% =
26. 26.452 decreased by 75% =
27. 27.250 decreased by 40% =
28. 28.245 increased by 20% =
29. 29.425 increased by 8% =
30. 30.50 increased by 8% =
31. 31.760 increased by 5% =
32. 32.225 decreased by 12% =
33. 33.450 decreased by 12% =
34. 34.60 decreased by 5% =
35. 35.620 decreased by 20% =
36. 36.450 decreased by 20% =
37. 37.220 decreased by 15% =
38. 38.140 increased by 10% =
39. 39.600 increased by 5% =
40. 40.320 increased by 35% =

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