Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 362 · 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. 1.800 decreased by 5% =
2. 2.185 decreased by 40% =
3. 3.565 increased by 20% =
4. 4.135 decreased by 40% =
5. 5.240 increased by 5% =
6. 6.520 decreased by 5% =
7. 7.655 decreased by 60% =
8. 8.300 increased by 30% =
9. 9.670 increased by 30% =
10. 10.540 increased by 5% =
11. 11.758 decreased by 50% =
12. 12.484 increased by 50% =
13. 13.175 increased by 12% =
14. 14.520 increased by 75% =
15. 15.405 decreased by 20% =
16. 16.225 decreased by 20% =
17. 17.485 increased by 20% =
18. 18.380 decreased by 35% =
19. 19.595 decreased by 40% =
20. 20.500 increased by 50% =
21. 21.220 increased by 5% =
22. 22.364 increased by 75% =
23. 23.225 decreased by 20% =
24. 24.680 increased by 30% =
25. 25.800 decreased by 40% =
26. 26.180 increased by 15% =
27. 27.600 decreased by 40% =
28. 28.440 decreased by 40% =
29. 29.650 increased by 12% =
30. 30.740 increased by 30% =
31. 31.680 increased by 35% =
32. 32.64 increased by 75% =
33. 33.80 decreased by 10% =
34. 34.276 increased by 25% =
35. 35.425 decreased by 20% =
36. 36.260 decreased by 10% =
37. 37.560 increased by 25% =
38. 38.520 decreased by 5% =
39. 39.544 increased by 25% =
40. 40.420 increased by 35% =

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