Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 154 · 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. 1.132 decreased by 50% =
2. 2.650 increased by 8% =
3. 3.660 decreased by 15% =
4. 4.390 increased by 30% =
5. 5.175 increased by 12% =
6. 6.250 increased by 10% =
7. 7.425 decreased by 8% =
8. 8.80 increased by 35% =
9. 9.325 increased by 8% =
10. 10.200 increased by 5% =
11. 11.330 increased by 40% =
12. 12.420 increased by 5% =
13. 13.180 decreased by 5% =
14. 14.160 increased by 5% =
15. 15.768 increased by 75% =
16. 16.40 increased by 15% =
17. 17.360 increased by 10% =
18. 18.250 increased by 12% =
19. 19.325 decreased by 60% =
20. 20.600 decreased by 40% =
21. 21.385 decreased by 40% =
22. 22.360 increased by 5% =
23. 23.740 increased by 30% =
24. 24.380 decreased by 5% =
25. 25.130 increased by 30% =
26. 26.452 decreased by 25% =
27. 27.250 increased by 10% =
28. 28.650 decreased by 30% =
29. 29.705 increased by 40% =
30. 30.440 increased by 30% =
31. 31.564 increased by 75% =
32. 32.740 decreased by 15% =
33. 33.600 increased by 10% =
34. 34.212 increased by 50% =
35. 35.675 decreased by 12% =
36. 36.325 increased by 8% =
37. 37.260 increased by 5% =
38. 38.340 increased by 40% =
39. 39.250 decreased by 30% =
40. 40.170 increased by 30% =

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