Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 129 · 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. 1.575 increased by 12% =
2. 2.448 increased by 25% =
3. 3.60 increased by 15% =
4. 4.615 increased by 20% =
5. 5.100 decreased by 5% =
6. 6.400 increased by 30% =
7. 7.740 decreased by 50% =
8. 8.150 decreased by 12% =
9. 9.420 increased by 30% =
10. 10.380 increased by 25% =
11. 11.340 increased by 5% =
12. 12.495 decreased by 20% =
13. 13.775 increased by 60% =
14. 14.680 increased by 15% =
15. 15.595 decreased by 60% =
16. 16.150 increased by 10% =
17. 17.175 increased by 8% =
18. 18.300 decreased by 8% =
19. 19.270 increased by 30% =
20. 20.375 increased by 8% =
21. 21.104 increased by 50% =
22. 22.320 increased by 20% =
23. 23.260 decreased by 5% =
24. 24.320 increased by 5% =
25. 25.340 increased by 35% =
26. 26.678 decreased by 50% =
27. 27.680 decreased by 5% =
28. 28.540 decreased by 50% =
29. 29.760 increased by 15% =
30. 30.205 decreased by 40% =
31. 31.460 increased by 5% =
32. 32.620 increased by 60% =
33. 33.80 decreased by 10% =
34. 34.360 increased by 40% =
35. 35.580 decreased by 35% =
36. 36.475 decreased by 60% =
37. 37.225 increased by 12% =
38. 38.564 increased by 25% =
39. 39.720 decreased by 15% =
40. 40.404 increased by 25% =

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