Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 76 · 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. 1.670 decreased by 60% =
2. 2.190 increased by 10% =
3. 3.100 increased by 12% =
4. 4.265 increased by 20% =
5. 5.600 decreased by 75% =
6. 6.740 decreased by 5% =
7. 7.532 decreased by 50% =
8. 8.465 decreased by 40% =
9. 9.740 increased by 35% =
10. 10.40 decreased by 10% =
11. 11.524 increased by 50% =
12. 12.520 decreased by 15% =
13. 13.468 increased by 75% =
14. 14.310 increased by 10% =
15. 15.240 decreased by 15% =
16. 16.100 increased by 8% =
17. 17.55 decreased by 20% =
18. 18.225 decreased by 20% =
19. 19.775 increased by 8% =
20. 20.384 increased by 25% =
21. 21.425 decreased by 20% =
22. 22.120 decreased by 60% =
23. 23.190 increased by 30% =
24. 24.550 increased by 8% =
25. 25.300 increased by 8% =
26. 26.490 decreased by 40% =
27. 27.100 increased by 5% =
28. 28.380 increased by 30% =
29. 29.400 decreased by 5% =
30. 30.800 decreased by 12% =
31. 31.395 decreased by 20% =
32. 32.500 increased by 35% =
33. 33.655 increased by 40% =
34. 34.600 decreased by 12% =
35. 35.45 increased by 60% =
36. 36.440 decreased by 5% =
37. 37.750 decreased by 60% =
38. 38.590 increased by 10% =
39. 39.100 decreased by 20% =
40. 40.440 increased by 15% =

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