Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 858 · 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. 1.475 increased by 60% =
2. 2.530 decreased by 60% =
3. 3.280 decreased by 15% =
4. 4.380 decreased by 15% =
5. 5.680 increased by 60% =
6. 6.800 decreased by 10% =
7. 7.320 increased by 30% =
8. 8.80 decreased by 15% =
9. 9.90 decreased by 30% =
10. 10.368 increased by 25% =
11. 11.325 increased by 8% =
12. 12.200 increased by 5% =
13. 13.640 increased by 35% =
14. 14.770 increased by 10% =
15. 15.724 decreased by 25% =
16. 16.575 decreased by 8% =
17. 17.540 increased by 35% =
18. 18.280 increased by 35% =
19. 19.90 decreased by 30% =
20. 20.470 decreased by 30% =
21. 21.40 decreased by 40% =
22. 22.120 increased by 5% =
23. 23.505 decreased by 20% =
24. 24.700 increased by 15% =
25. 25.730 decreased by 10% =
26. 26.730 decreased by 10% =
27. 27.470 increased by 40% =
28. 28.376 decreased by 25% =
29. 29.512 increased by 25% =
30. 30.700 increased by 30% =
31. 31.255 increased by 20% =
32. 32.175 decreased by 8% =
33. 33.232 increased by 75% =
34. 34.510 increased by 20% =
35. 35.168 decreased by 50% =
36. 36.116 decreased by 75% =
37. 37.130 decreased by 10% =
38. 38.550 increased by 12% =
39. 39.400 increased by 5% =
40. 40.750 decreased by 12% =

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