Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 569 · 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. 1.500 decreased by 10% =
2. 2.420 increased by 20% =
3. 3.198 increased by 50% =
4. 4.525 increased by 12% =
5. 5.800 increased by 35% =
6. 6.92 decreased by 50% =
7. 7.530 decreased by 20% =
8. 8.642 increased by 50% =
9. 9.550 decreased by 12% =
10. 10.140 decreased by 75% =
11. 11.490 decreased by 30% =
12. 12.100 decreased by 8% =
13. 13.430 decreased by 10% =
14. 14.420 increased by 25% =
15. 15.254 increased by 50% =
16. 16.650 increased by 40% =
17. 17.705 decreased by 60% =
18. 18.120 increased by 15% =
19. 19.300 increased by 15% =
20. 20.775 decreased by 12% =
21. 21.708 decreased by 75% =
22. 22.260 decreased by 25% =
23. 23.55 decreased by 60% =
24. 24.360 decreased by 5% =
25. 25.390 decreased by 40% =
26. 26.732 increased by 75% =
27. 27.550 decreased by 20% =
28. 28.520 increased by 35% =
29. 29.400 decreased by 30% =
30. 30.190 increased by 10% =
31. 31.452 decreased by 75% =
32. 32.640 increased by 5% =
33. 33.744 increased by 25% =
34. 34.380 increased by 40% =
35. 35.240 increased by 5% =
36. 36.660 decreased by 5% =
37. 37.475 decreased by 8% =
38. 38.480 decreased by 35% =
39. 39.395 decreased by 40% =
40. 40.340 decreased by 15% =

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