Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 102 · 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. 1.704 increased by 25% =
2. 2.714 decreased by 50% =
3. 3.190 increased by 10% =
4. 4.300 decreased by 5% =
5. 5.166 decreased by 50% =
6. 6.140 increased by 10% =
7. 7.286 decreased by 50% =
8. 8.750 decreased by 12% =
9. 9.80 decreased by 15% =
10. 10.384 decreased by 75% =
11. 11.560 decreased by 10% =
12. 12.700 decreased by 8% =
13. 13.250 increased by 12% =
14. 14.782 decreased by 50% =
15. 15.490 decreased by 20% =
16. 16.530 increased by 60% =
17. 17.460 decreased by 50% =
18. 18.352 decreased by 75% =
19. 19.680 increased by 15% =
20. 20.520 decreased by 5% =
21. 21.780 increased by 35% =
22. 22.120 increased by 5% =
23. 23.76 increased by 25% =
24. 24.450 decreased by 10% =
25. 25.775 increased by 8% =
26. 26.690 increased by 10% =
27. 27.90 decreased by 10% =
28. 28.325 increased by 8% =
29. 29.340 increased by 10% =
30. 30.700 increased by 10% =
31. 31.130 decreased by 10% =
32. 32.380 decreased by 15% =
33. 33.555 decreased by 60% =
34. 34.300 increased by 30% =
35. 35.700 increased by 15% =
36. 36.600 decreased by 20% =
37. 37.715 decreased by 40% =
38. 38.720 decreased by 15% =
39. 39.270 decreased by 10% =
40. 40.55 decreased by 60% =

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