Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 397 · 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. 1.240 increased by 35% =
2. 2.560 decreased by 75% =
3. 3.500 decreased by 5% =
4. 4.690 increased by 10% =
5. 5.725 increased by 12% =
6. 6.560 decreased by 50% =
7. 7.680 increased by 30% =
8. 8.340 decreased by 5% =
9. 9.40 increased by 5% =
10. 10.225 decreased by 8% =
11. 11.780 decreased by 15% =
12. 12.230 increased by 10% =
13. 13.412 increased by 25% =
14. 14.180 decreased by 10% =
15. 15.540 increased by 10% =
16. 16.74 decreased by 50% =
17. 17.425 decreased by 8% =
18. 18.50 increased by 40% =
19. 19.188 decreased by 75% =
20. 20.275 decreased by 12% =
21. 21.200 decreased by 15% =
22. 22.225 increased by 12% =
23. 23.305 increased by 40% =
24. 24.140 decreased by 60% =
25. 25.725 increased by 8% =
26. 26.500 decreased by 10% =
27. 27.140 decreased by 25% =
28. 28.240 increased by 10% =
29. 29.800 decreased by 5% =
30. 30.695 increased by 20% =
31. 31.420 decreased by 15% =
32. 32.450 increased by 30% =
33. 33.625 increased by 20% =
34. 34.354 decreased by 50% =
35. 35.752 increased by 75% =
36. 36.100 increased by 12% =
37. 37.228 decreased by 50% =
38. 38.760 decreased by 75% =
39. 39.420 decreased by 25% =
40. 40.90 increased by 30% =

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