Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 720 · 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. 1.100 decreased by 60% =
2. 2.460 increased by 60% =
3. 3.280 decreased by 5% =
4. 4.375 decreased by 12% =
5. 5.250 increased by 8% =
6. 6.800 increased by 35% =
7. 7.400 increased by 8% =
8. 8.250 decreased by 12% =
9. 9.470 increased by 20% =
10. 10.440 increased by 5% =
11. 11.240 increased by 60% =
12. 12.130 increased by 60% =
13. 13.790 increased by 50% =
14. 14.700 increased by 12% =
15. 15.648 increased by 25% =
16. 16.660 increased by 25% =
17. 17.235 increased by 60% =
18. 18.510 decreased by 60% =
19. 19.364 decreased by 25% =
20. 20.165 increased by 20% =
21. 21.680 decreased by 20% =
22. 22.50 decreased by 8% =
23. 23.375 decreased by 8% =
24. 24.600 increased by 40% =
25. 25.160 decreased by 5% =
26. 26.320 decreased by 5% =
27. 27.350 decreased by 8% =
28. 28.660 increased by 5% =
29. 29.120 decreased by 15% =
30. 30.308 decreased by 25% =
31. 31.114 decreased by 50% =
32. 32.430 decreased by 30% =
33. 33.520 increased by 60% =
34. 34.500 decreased by 10% =
35. 35.520 decreased by 20% =
36. 36.530 increased by 40% =
37. 37.255 increased by 20% =
38. 38.748 increased by 25% =
39. 39.520 increased by 40% =
40. 40.580 decreased by 30% =

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