Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 180 · 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. 1.130 decreased by 20% =
2. 2.620 decreased by 5% =
3. 3.180 increased by 15% =
4. 4.495 decreased by 20% =
5. 5.700 increased by 12% =
6. 6.280 increased by 5% =
7. 7.505 increased by 20% =
8. 8.60 increased by 15% =
9. 9.380 decreased by 5% =
10. 10.120 decreased by 15% =
11. 11.545 decreased by 60% =
12. 12.40 decreased by 15% =
13. 13.250 decreased by 20% =
14. 14.40 increased by 15% =
15. 15.270 increased by 30% =
16. 16.600 increased by 25% =
17. 17.195 increased by 20% =
18. 18.280 decreased by 75% =
19. 19.660 increased by 60% =
20. 20.412 decreased by 25% =
21. 21.600 increased by 15% =
22. 22.475 increased by 60% =
23. 23.70 decreased by 60% =
24. 24.135 decreased by 60% =
25. 25.520 decreased by 15% =
26. 26.265 increased by 60% =
27. 27.675 increased by 12% =
28. 28.385 increased by 20% =
29. 29.380 decreased by 35% =
30. 30.750 increased by 30% =
31. 31.100 increased by 15% =
32. 32.475 decreased by 40% =
33. 33.684 increased by 75% =
34. 34.138 increased by 50% =
35. 35.700 increased by 8% =
36. 36.360 decreased by 20% =
37. 37.484 increased by 75% =
38. 38.600 decreased by 40% =
39. 39.235 decreased by 40% =
40. 40.375 decreased by 12% =

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