Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 188 · 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. 1.504 increased by 25% =
2. 2.120 decreased by 30% =
3. 3.250 increased by 50% =
4. 4.360 increased by 25% =
5. 5.575 increased by 12% =
6. 6.504 increased by 50% =
7. 7.210 decreased by 30% =
8. 8.540 increased by 15% =
9. 9.140 increased by 35% =
10. 10.700 decreased by 5% =
11. 11.290 increased by 20% =
12. 12.508 decreased by 75% =
13. 13.680 decreased by 10% =
14. 14.270 decreased by 10% =
15. 15.256 increased by 75% =
16. 16.240 decreased by 35% =
17. 17.600 decreased by 50% =
18. 18.380 increased by 30% =
19. 19.500 decreased by 5% =
20. 20.320 increased by 60% =
21. 21.50 increased by 12% =
22. 22.775 increased by 60% =
23. 23.744 increased by 25% =
24. 24.460 decreased by 5% =
25. 25.230 increased by 20% =
26. 26.270 decreased by 10% =
27. 27.800 increased by 35% =
28. 28.772 decreased by 75% =
29. 29.760 increased by 20% =
30. 30.700 decreased by 8% =
31. 31.660 increased by 35% =
32. 32.700 increased by 35% =
33. 33.304 decreased by 75% =
34. 34.240 increased by 75% =
35. 35.792 decreased by 50% =
36. 36.60 increased by 20% =
37. 37.110 increased by 20% =
38. 38.395 increased by 40% =
39. 39.540 increased by 35% =
40. 40.550 increased by 12% =

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