Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 215 · 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. 1.180 decreased by 15% =
2. 2.300 decreased by 40% =
3. 3.200 decreased by 8% =
4. 4.175 decreased by 12% =
5. 5.60 increased by 15% =
6. 6.100 decreased by 5% =
7. 7.460 decreased by 15% =
8. 8.600 increased by 75% =
9. 9.640 decreased by 5% =
10. 10.732 decreased by 50% =
11. 11.760 decreased by 60% =
12. 12.130 increased by 10% =
13. 13.540 increased by 35% =
14. 14.600 increased by 12% =
15. 15.705 increased by 20% =
16. 16.40 decreased by 20% =
17. 17.528 decreased by 25% =
18. 18.550 decreased by 10% =
19. 19.390 increased by 30% =
20. 20.140 decreased by 35% =
21. 21.215 decreased by 40% =
22. 22.630 increased by 10% =
23. 23.580 decreased by 75% =
24. 24.620 decreased by 15% =
25. 25.224 increased by 25% =
26. 26.680 increased by 30% =
27. 27.116 increased by 75% =
28. 28.66 increased by 50% =
29. 29.725 increased by 12% =
30. 30.160 increased by 5% =
31. 31.270 increased by 30% =
32. 32.765 decreased by 60% =
33. 33.500 increased by 15% =
34. 34.265 decreased by 60% =
35. 35.75 decreased by 8% =
36. 36.80 increased by 5% =
37. 37.184 increased by 25% =
38. 38.260 increased by 75% =
39. 39.60 increased by 25% =
40. 40.376 increased by 25% =

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