Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 748 · 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. 1.120 decreased by 15% =
2. 2.680 increased by 15% =
3. 3.216 increased by 25% =
4. 4.626 increased by 50% =
5. 5.188 increased by 75% =
6. 6.168 increased by 50% =
7. 7.110 increased by 20% =
8. 8.340 increased by 10% =
9. 9.425 increased by 12% =
10. 10.120 decreased by 40% =
11. 11.528 increased by 25% =
12. 12.560 increased by 35% =
13. 13.636 increased by 75% =
14. 14.560 increased by 5% =
15. 15.490 decreased by 20% =
16. 16.375 increased by 8% =
17. 17.560 decreased by 35% =
18. 18.690 decreased by 10% =
19. 19.400 decreased by 15% =
20. 20.650 increased by 10% =
21. 21.250 increased by 8% =
22. 22.150 decreased by 8% =
23. 23.648 decreased by 75% =
24. 24.220 increased by 10% =
25. 25.180 increased by 15% =
26. 26.694 decreased by 50% =
27. 27.218 decreased by 50% =
28. 28.180 decreased by 15% =
29. 29.50 increased by 40% =
30. 30.100 decreased by 12% =
31. 31.732 decreased by 75% =
32. 32.425 increased by 12% =
33. 33.360 decreased by 35% =
34. 34.60 increased by 5% =
35. 35.536 decreased by 25% =
36. 36.140 increased by 15% =
37. 37.600 decreased by 60% =
38. 38.150 decreased by 8% =
39. 39.588 decreased by 50% =
40. 40.88 increased by 25% =

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