Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 727 · 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. 1.175 decreased by 8% =
2. 2.100 increased by 12% =
3. 3.100 decreased by 8% =
4. 4.368 increased by 75% =
5. 5.320 decreased by 35% =
6. 6.740 decreased by 75% =
7. 7.440 decreased by 50% =
8. 8.250 increased by 20% =
9. 9.350 increased by 10% =
10. 10.340 increased by 25% =
11. 11.170 decreased by 40% =
12. 12.425 decreased by 60% =
13. 13.80 increased by 40% =
14. 14.375 decreased by 12% =
15. 15.375 decreased by 8% =
16. 16.515 increased by 40% =
17. 17.750 decreased by 20% =
18. 18.340 decreased by 30% =
19. 19.684 decreased by 25% =
20. 20.740 decreased by 15% =
21. 21.580 increased by 35% =
22. 22.740 increased by 35% =
23. 23.600 decreased by 40% =
24. 24.360 increased by 30% =
25. 25.500 increased by 15% =
26. 26.540 increased by 5% =
27. 27.590 decreased by 10% =
28. 28.468 increased by 25% =
29. 29.550 increased by 60% =
30. 30.260 decreased by 15% =
31. 31.510 increased by 60% =
32. 32.90 increased by 30% =
33. 33.736 increased by 50% =
34. 34.560 increased by 5% =
35. 35.796 increased by 25% =
36. 36.630 increased by 10% =
37. 37.756 decreased by 25% =
38. 38.368 increased by 25% =
39. 39.210 decreased by 40% =
40. 40.325 increased by 8% =

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