Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 616 · 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. 1.40 decreased by 25% =
2. 2.150 decreased by 40% =
3. 3.150 decreased by 8% =
4. 4.580 decreased by 15% =
5. 5.685 increased by 60% =
6. 6.288 decreased by 75% =
7. 7.660 decreased by 30% =
8. 8.75 decreased by 8% =
9. 9.55 decreased by 60% =
10. 10.420 decreased by 5% =
11. 11.710 decreased by 40% =
12. 12.250 decreased by 12% =
13. 13.680 increased by 15% =
14. 14.460 increased by 35% =
15. 15.40 decreased by 35% =
16. 16.380 decreased by 15% =
17. 17.560 increased by 40% =
18. 18.345 decreased by 40% =
19. 19.420 increased by 5% =
20. 20.100 increased by 20% =
21. 21.765 increased by 40% =
22. 22.424 increased by 75% =
23. 23.136 increased by 50% =
24. 24.230 increased by 10% =
25. 25.605 decreased by 40% =
26. 26.280 increased by 15% =
27. 27.105 decreased by 40% =
28. 28.460 increased by 20% =
29. 29.90 increased by 20% =
30. 30.225 increased by 8% =
31. 31.490 decreased by 30% =
32. 32.575 increased by 12% =
33. 33.110 increased by 20% =
34. 34.740 decreased by 35% =
35. 35.700 decreased by 10% =
36. 36.150 decreased by 12% =
37. 37.280 increased by 15% =
38. 38.760 decreased by 10% =
39. 39.720 decreased by 20% =
40. 40.125 decreased by 60% =

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