Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 234 · 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. 1.160 decreased by 60% =
2. 2.300 increased by 12% =
3. 3.720 decreased by 35% =
4. 4.300 decreased by 15% =
5. 5.800 increased by 8% =
6. 6.400 increased by 35% =
7. 7.800 increased by 15% =
8. 8.300 decreased by 20% =
9. 9.370 increased by 50% =
10. 10.75 decreased by 12% =
11. 11.235 decreased by 60% =
12. 12.700 increased by 10% =
13. 13.360 increased by 20% =
14. 14.60 decreased by 15% =
15. 15.725 increased by 8% =
16. 16.684 decreased by 75% =
17. 17.150 increased by 8% =
18. 18.200 increased by 12% =
19. 19.700 increased by 8% =
20. 20.650 decreased by 12% =
21. 21.776 increased by 50% =
22. 22.60 increased by 20% =
23. 23.738 decreased by 50% =
24. 24.400 increased by 5% =
25. 25.280 decreased by 15% =
26. 26.175 increased by 12% =
27. 27.460 increased by 15% =
28. 28.300 decreased by 8% =
29. 29.80 increased by 35% =
30. 30.172 decreased by 25% =
31. 31.174 decreased by 50% =
32. 32.140 decreased by 10% =
33. 33.600 decreased by 12% =
34. 34.100 decreased by 5% =
35. 35.475 decreased by 8% =
36. 36.800 increased by 35% =
37. 37.220 decreased by 5% =
38. 38.80 decreased by 60% =
39. 39.560 increased by 15% =
40. 40.210 increased by 30% =

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