Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 263 · 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. 1.272 increased by 75% =
2. 2.140 increased by 30% =
3. 3.200 increased by 15% =
4. 4.690 decreased by 10% =
5. 5.240 decreased by 35% =
6. 6.660 decreased by 30% =
7. 7.540 decreased by 5% =
8. 8.560 increased by 25% =
9. 9.480 decreased by 10% =
10. 10.180 decreased by 10% =
11. 11.800 decreased by 8% =
12. 12.680 increased by 10% =
13. 13.126 increased by 50% =
14. 14.110 increased by 30% =
15. 15.776 increased by 25% =
16. 16.220 decreased by 15% =
17. 17.330 increased by 20% =
18. 18.410 increased by 10% =
19. 19.600 increased by 10% =
20. 20.332 decreased by 25% =
21. 21.450 increased by 30% =
22. 22.750 decreased by 8% =
23. 23.295 increased by 60% =
24. 24.175 decreased by 20% =
25. 25.660 decreased by 10% =
26. 26.450 decreased by 30% =
27. 27.305 increased by 20% =
28. 28.700 decreased by 12% =
29. 29.400 increased by 8% =
30. 30.375 decreased by 12% =
31. 31.800 decreased by 8% =
32. 32.500 increased by 15% =
33. 33.256 decreased by 75% =
34. 34.240 increased by 15% =
35. 35.550 increased by 8% =
36. 36.665 increased by 20% =
37. 37.550 decreased by 12% =
38. 38.425 decreased by 8% =
39. 39.125 increased by 8% =
40. 40.260 increased by 35% =

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