Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 340 · 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. 1.710 increased by 30% =
2. 2.310 increased by 40% =
3. 3.216 decreased by 25% =
4. 4.600 decreased by 5% =
5. 5.56 decreased by 75% =
6. 6.172 decreased by 75% =
7. 7.650 increased by 8% =
8. 8.520 increased by 5% =
9. 9.560 decreased by 15% =
10. 10.325 increased by 8% =
11. 11.250 increased by 30% =
12. 12.380 increased by 10% =
13. 13.60 increased by 5% =
14. 14.315 decreased by 20% =
15. 15.115 increased by 60% =
16. 16.610 increased by 30% =
17. 17.40 decreased by 15% =
18. 18.40 increased by 60% =
19. 19.800 increased by 8% =
20. 20.260 increased by 10% =
21. 21.350 increased by 8% =
22. 22.420 increased by 35% =
23. 23.525 decreased by 12% =
24. 24.690 decreased by 30% =
25. 25.325 decreased by 12% =
26. 26.710 decreased by 30% =
27. 27.350 increased by 8% =
28. 28.560 increased by 25% =
29. 29.520 decreased by 10% =
30. 30.710 decreased by 40% =
31. 31.360 decreased by 15% =
32. 32.680 increased by 75% =
33. 33.230 increased by 60% =
34. 34.790 decreased by 40% =
35. 35.740 decreased by 25% =
36. 36.680 increased by 35% =
37. 37.560 decreased by 20% =
38. 38.740 increased by 5% =
39. 39.175 increased by 12% =
40. 40.110 decreased by 10% =

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