Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 393 · 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 15% =
2. 2.460 increased by 5% =
3. 3.110 decreased by 10% =
4. 4.652 decreased by 25% =
5. 5.236 decreased by 25% =
6. 6.260 increased by 35% =
7. 7.220 decreased by 15% =
8. 8.795 increased by 20% =
9. 9.655 increased by 60% =
10. 10.40 decreased by 20% =
11. 11.200 decreased by 25% =
12. 12.355 increased by 60% =
13. 13.340 decreased by 30% =
14. 14.80 decreased by 30% =
15. 15.575 increased by 12% =
16. 16.175 decreased by 60% =
17. 17.710 decreased by 20% =
18. 18.444 decreased by 25% =
19. 19.310 increased by 10% =
20. 20.720 increased by 60% =
21. 21.692 decreased by 25% =
22. 22.600 increased by 8% =
23. 23.580 decreased by 10% =
24. 24.800 increased by 30% =
25. 25.560 decreased by 15% =
26. 26.155 decreased by 20% =
27. 27.310 increased by 40% =
28. 28.416 increased by 50% =
29. 29.740 decreased by 15% =
30. 30.164 increased by 50% =
31. 31.430 decreased by 10% =
32. 32.220 decreased by 5% =
33. 33.630 increased by 40% =
34. 34.220 increased by 15% =
35. 35.640 decreased by 10% =
36. 36.72 increased by 75% =
37. 37.490 increased by 40% =
38. 38.750 increased by 8% =
39. 39.370 increased by 20% =
40. 40.316 decreased by 75% =

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