Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 882 · 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. 1.612 increased by 25% =
2. 2.370 increased by 10% =
3. 3.50 decreased by 8% =
4. 4.750 increased by 20% =
5. 5.390 decreased by 50% =
6. 6.376 decreased by 25% =
7. 7.80 increased by 5% =
8. 8.60 decreased by 15% =
9. 9.150 increased by 60% =
10. 10.370 increased by 50% =
11. 11.70 decreased by 20% =
12. 12.360 decreased by 5% =
13. 13.220 decreased by 15% =
14. 14.200 decreased by 75% =
15. 15.720 increased by 40% =
16. 16.425 decreased by 12% =
17. 17.600 increased by 8% =
18. 18.410 increased by 10% =
19. 19.600 decreased by 15% =
20. 20.360 increased by 10% =
21. 21.330 increased by 10% =
22. 22.232 increased by 50% =
23. 23.672 decreased by 25% =
24. 24.85 increased by 20% =
25. 25.414 increased by 50% =
26. 26.750 increased by 20% =
27. 27.120 decreased by 60% =
28. 28.60 increased by 10% =
29. 29.200 decreased by 30% =
30. 30.540 decreased by 35% =
31. 31.78 decreased by 50% =
32. 32.420 increased by 10% =
33. 33.225 decreased by 12% =
34. 34.80 decreased by 10% =
35. 35.500 increased by 12% =
36. 36.650 increased by 10% =
37. 37.228 decreased by 25% =
38. 38.140 decreased by 15% =
39. 39.130 increased by 20% =
40. 40.150 decreased by 12% =

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