Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 808 · 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. 1.255 decreased by 40% =
2. 2.700 increased by 8% =
3. 3.405 increased by 20% =
4. 4.760 decreased by 15% =
5. 5.140 increased by 15% =
6. 6.120 decreased by 20% =
7. 7.680 increased by 10% =
8. 8.160 decreased by 10% =
9. 9.642 increased by 50% =
10. 10.570 increased by 30% =
11. 11.500 decreased by 30% =
12. 12.395 decreased by 20% =
13. 13.200 increased by 8% =
14. 14.110 decreased by 10% =
15. 15.210 increased by 40% =
16. 16.200 decreased by 5% =
17. 17.392 decreased by 50% =
18. 18.535 decreased by 20% =
19. 19.240 decreased by 15% =
20. 20.284 increased by 75% =
21. 21.110 decreased by 50% =
22. 22.250 decreased by 60% =
23. 23.670 decreased by 10% =
24. 24.165 increased by 20% =
25. 25.735 decreased by 20% =
26. 26.380 decreased by 35% =
27. 27.108 increased by 50% =
28. 28.636 increased by 75% =
29. 29.50 increased by 12% =
30. 30.285 decreased by 40% =
31. 31.670 increased by 50% =
32. 32.190 decreased by 10% =
33. 33.200 increased by 15% =
34. 34.780 increased by 20% =
35. 35.385 increased by 20% =
36. 36.748 decreased by 25% =
37. 37.420 increased by 60% =
38. 38.68 decreased by 50% =
39. 39.760 decreased by 10% =
40. 40.142 increased by 50% =

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