Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 122 · 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. 1.680 decreased by 35% =
2. 2.250 increased by 8% =
3. 3.530 decreased by 40% =
4. 4.660 decreased by 10% =
5. 5.800 increased by 50% =
6. 6.40 increased by 50% =
7. 7.750 decreased by 10% =
8. 8.775 decreased by 12% =
9. 9.40 decreased by 5% =
10. 10.150 increased by 12% =
11. 11.798 increased by 50% =
12. 12.290 increased by 50% =
13. 13.180 decreased by 10% =
14. 14.650 decreased by 60% =
15. 15.90 increased by 10% =
16. 16.180 increased by 5% =
17. 17.790 increased by 10% =
18. 18.276 decreased by 75% =
19. 19.140 decreased by 10% =
20. 20.720 decreased by 35% =
21. 21.800 decreased by 15% =
22. 22.180 decreased by 15% =
23. 23.660 increased by 15% =
24. 24.720 decreased by 50% =
25. 25.100 increased by 15% =
26. 26.75 decreased by 40% =
27. 27.45 decreased by 40% =
28. 28.140 increased by 10% =
29. 29.525 increased by 12% =
30. 30.75 decreased by 8% =
31. 31.60 increased by 15% =
32. 32.190 decreased by 10% =
33. 33.170 decreased by 40% =
34. 34.475 decreased by 8% =
35. 35.610 decreased by 60% =
36. 36.225 increased by 8% =
37. 37.110 increased by 10% =
38. 38.740 decreased by 25% =
39. 39.435 decreased by 20% =
40. 40.80 decreased by 15% =

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