Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 937 · 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. 1.354 decreased by 50% =
2. 2.470 increased by 30% =
3. 3.515 increased by 20% =
4. 4.380 increased by 5% =
5. 5.676 increased by 75% =
6. 6.180 increased by 30% =
7. 7.185 decreased by 40% =
8. 8.564 increased by 25% =
9. 9.380 decreased by 5% =
10. 10.560 increased by 10% =
11. 11.332 increased by 25% =
12. 12.40 increased by 30% =
13. 13.600 increased by 5% =
14. 14.345 increased by 20% =
15. 15.300 increased by 10% =
16. 16.520 decreased by 15% =
17. 17.328 increased by 25% =
18. 18.260 increased by 60% =
19. 19.282 decreased by 50% =
20. 20.290 decreased by 30% =
21. 21.560 increased by 10% =
22. 22.535 decreased by 40% =
23. 23.600 increased by 5% =
24. 24.428 increased by 25% =
25. 25.120 decreased by 15% =
26. 26.560 increased by 15% =
27. 27.790 decreased by 30% =
28. 28.560 decreased by 10% =
29. 29.665 decreased by 40% =
30. 30.520 increased by 30% =
31. 31.104 increased by 25% =
32. 32.40 increased by 5% =
33. 33.640 increased by 20% =
34. 34.640 increased by 20% =
35. 35.200 decreased by 8% =
36. 36.350 decreased by 8% =
37. 37.620 increased by 5% =
38. 38.632 decreased by 50% =
39. 39.690 decreased by 10% =
40. 40.560 decreased by 60% =

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