Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 570 · 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. 1.52 increased by 75% =
2. 2.380 decreased by 35% =
3. 3.700 increased by 12% =
4. 4.750 decreased by 10% =
5. 5.450 increased by 8% =
6. 6.775 increased by 40% =
7. 7.590 decreased by 10% =
8. 8.100 increased by 35% =
9. 9.655 increased by 20% =
10. 10.210 increased by 10% =
11. 11.225 decreased by 8% =
12. 12.90 decreased by 30% =
13. 13.504 decreased by 25% =
14. 14.720 increased by 30% =
15. 15.340 increased by 40% =
16. 16.450 increased by 30% =
17. 17.400 increased by 8% =
18. 18.248 decreased by 50% =
19. 19.760 decreased by 35% =
20. 20.652 decreased by 50% =
21. 21.500 increased by 35% =
22. 22.775 decreased by 8% =
23. 23.795 increased by 20% =
24. 24.95 decreased by 20% =
25. 25.732 decreased by 25% =
26. 26.260 decreased by 15% =
27. 27.520 increased by 35% =
28. 28.110 decreased by 40% =
29. 29.800 increased by 5% =
30. 30.520 decreased by 10% =
31. 31.515 decreased by 40% =
32. 32.410 increased by 30% =
33. 33.370 increased by 30% =
34. 34.550 increased by 8% =
35. 35.40 increased by 30% =
36. 36.310 decreased by 30% =
37. 37.65 increased by 20% =
38. 38.500 decreased by 8% =
39. 39.108 increased by 25% =
40. 40.680 increased by 35% =

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