Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 268 · 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. 1.740 decreased by 15% =
2. 2.280 increased by 30% =
3. 3.300 decreased by 20% =
4. 4.740 decreased by 10% =
5. 5.584 decreased by 75% =
6. 6.425 increased by 12% =
7. 7.636 decreased by 50% =
8. 8.105 increased by 20% =
9. 9.45 decreased by 40% =
10. 10.270 increased by 60% =
11. 11.664 decreased by 75% =
12. 12.220 increased by 60% =
13. 13.650 decreased by 12% =
14. 14.590 decreased by 30% =
15. 15.624 decreased by 25% =
16. 16.575 increased by 12% =
17. 17.725 decreased by 8% =
18. 18.215 decreased by 20% =
19. 19.200 increased by 20% =
20. 20.110 increased by 20% =
21. 21.760 decreased by 5% =
22. 22.220 increased by 60% =
23. 23.320 decreased by 10% =
24. 24.240 decreased by 15% =
25. 25.575 decreased by 12% =
26. 26.565 decreased by 40% =
27. 27.198 decreased by 50% =
28. 28.190 decreased by 20% =
29. 29.400 decreased by 8% =
30. 30.328 increased by 75% =
31. 31.380 increased by 10% =
32. 32.60 increased by 40% =
33. 33.465 increased by 20% =
34. 34.530 increased by 30% =
35. 35.675 increased by 8% =
36. 36.250 increased by 30% =
37. 37.164 increased by 25% =
38. 38.700 increased by 15% =
39. 39.260 decreased by 35% =
40. 40.750 decreased by 8% =

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