Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 740 · 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. 1.260 increased by 10% =
2. 2.480 decreased by 20% =
3. 3.776 increased by 50% =
4. 4.744 increased by 50% =
5. 5.175 decreased by 40% =
6. 6.80 increased by 10% =
7. 7.505 decreased by 20% =
8. 8.475 decreased by 60% =
9. 9.385 decreased by 20% =
10. 10.780 decreased by 15% =
11. 11.332 increased by 25% =
12. 12.290 increased by 40% =
13. 13.675 decreased by 8% =
14. 14.325 increased by 8% =
15. 15.512 decreased by 25% =
16. 16.240 decreased by 15% =
17. 17.320 increased by 50% =
18. 18.328 increased by 25% =
19. 19.420 increased by 10% =
20. 20.700 decreased by 12% =
21. 21.465 increased by 60% =
22. 22.500 increased by 10% =
23. 23.295 increased by 20% =
24. 24.250 increased by 8% =
25. 25.615 increased by 40% =
26. 26.50 decreased by 8% =
27. 27.200 decreased by 50% =
28. 28.124 decreased by 75% =
29. 29.680 decreased by 20% =
30. 30.250 decreased by 12% =
31. 31.375 decreased by 60% =
32. 32.440 decreased by 5% =
33. 33.660 decreased by 5% =
34. 34.372 increased by 25% =
35. 35.192 increased by 75% =
36. 36.120 increased by 75% =
37. 37.765 decreased by 40% =
38. 38.700 decreased by 10% =
39. 39.312 decreased by 25% =
40. 40.220 increased by 35% =

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