Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 955 · 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. 1.450 increased by 50% =
2. 2.520 decreased by 5% =
3. 3.300 increased by 15% =
4. 4.248 increased by 75% =
5. 5.488 increased by 25% =
6. 6.260 increased by 5% =
7. 7.370 increased by 10% =
8. 8.580 decreased by 5% =
9. 9.480 decreased by 15% =
10. 10.314 increased by 50% =
11. 11.560 decreased by 15% =
12. 12.560 decreased by 20% =
13. 13.504 decreased by 25% =
14. 14.175 decreased by 12% =
15. 15.575 increased by 12% =
16. 16.450 decreased by 30% =
17. 17.250 increased by 8% =
18. 18.800 decreased by 15% =
19. 19.600 decreased by 15% =
20. 20.355 increased by 60% =
21. 21.450 increased by 8% =
22. 22.305 increased by 20% =
23. 23.160 increased by 15% =
24. 24.70 increased by 20% =
25. 25.50 increased by 12% =
26. 26.140 decreased by 15% =
27. 27.100 decreased by 35% =
28. 28.60 increased by 60% =
29. 29.46 decreased by 50% =
30. 30.375 decreased by 8% =
31. 31.292 increased by 75% =
32. 32.160 increased by 5% =
33. 33.596 decreased by 50% =
34. 34.310 increased by 10% =
35. 35.580 decreased by 50% =
36. 36.125 increased by 12% =
37. 37.200 decreased by 75% =
38. 38.210 decreased by 10% =
39. 39.388 increased by 75% =
40. 40.68 increased by 50% =

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