Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 950 · 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. 1.310 increased by 50% =
2. 2.775 increased by 12% =
3. 3.695 decreased by 20% =
4. 4.220 decreased by 30% =
5. 5.660 decreased by 15% =
6. 6.234 decreased by 50% =
7. 7.725 increased by 40% =
8. 8.300 decreased by 35% =
9. 9.52 increased by 25% =
10. 10.375 decreased by 20% =
11. 11.480 decreased by 10% =
12. 12.735 increased by 40% =
13. 13.460 increased by 35% =
14. 14.80 decreased by 5% =
15. 15.235 increased by 20% =
16. 16.340 increased by 35% =
17. 17.650 decreased by 40% =
18. 18.625 increased by 12% =
19. 19.780 increased by 5% =
20. 20.525 increased by 8% =
21. 21.520 decreased by 5% =
22. 22.80 decreased by 10% =
23. 23.410 increased by 10% =
24. 24.50 increased by 10% =
25. 25.60 decreased by 15% =
26. 26.750 increased by 8% =
27. 27.125 increased by 8% =
28. 28.480 increased by 20% =
29. 29.360 decreased by 15% =
30. 30.650 decreased by 40% =
31. 31.140 decreased by 15% =
32. 32.610 increased by 40% =
33. 33.580 increased by 15% =
34. 34.705 increased by 20% =
35. 35.750 increased by 8% =
36. 36.780 increased by 5% =
37. 37.510 increased by 40% =
38. 38.525 increased by 8% =
39. 39.780 decreased by 10% =
40. 40.800 decreased by 35% =

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