Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 529 · 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 increased by 5% =
2. 2.785 decreased by 20% =
3. 3.80 increased by 60% =
4. 4.340 decreased by 15% =
5. 5.545 increased by 20% =
6. 6.594 increased by 50% =
7. 7.750 increased by 8% =
8. 8.70 decreased by 10% =
9. 9.325 decreased by 60% =
10. 10.350 increased by 8% =
11. 11.130 increased by 10% =
12. 12.140 decreased by 30% =
13. 13.46 increased by 50% =
14. 14.425 increased by 12% =
15. 15.780 decreased by 15% =
16. 16.428 increased by 25% =
17. 17.325 decreased by 60% =
18. 18.180 increased by 15% =
19. 19.80 decreased by 35% =
20. 20.400 increased by 8% =
21. 21.200 increased by 12% =
22. 22.420 increased by 20% =
23. 23.462 decreased by 50% =
24. 24.160 decreased by 5% =
25. 25.80 increased by 35% =
26. 26.430 decreased by 10% =
27. 27.200 increased by 30% =
28. 28.740 increased by 35% =
29. 29.720 increased by 15% =
30. 30.305 increased by 20% =
31. 31.655 decreased by 20% =
32. 32.82 increased by 50% =
33. 33.468 increased by 75% =
34. 34.190 decreased by 10% =
35. 35.90 decreased by 10% =
36. 36.100 decreased by 60% =
37. 37.740 decreased by 15% =
38. 38.170 increased by 10% =
39. 39.680 decreased by 35% =
40. 40.224 increased by 75% =

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