Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 504 · 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. 1.45 decreased by 20% =
2. 2.800 increased by 12% =
3. 3.440 decreased by 5% =
4. 4.425 increased by 12% =
5. 5.280 increased by 30% =
6. 6.555 increased by 20% =
7. 7.750 decreased by 60% =
8. 8.110 decreased by 10% =
9. 9.250 decreased by 12% =
10. 10.328 decreased by 75% =
11. 11.740 increased by 35% =
12. 12.400 decreased by 10% =
13. 13.550 increased by 20% =
14. 14.545 decreased by 60% =
15. 15.780 decreased by 35% =
16. 16.770 increased by 40% =
17. 17.170 increased by 60% =
18. 18.400 increased by 8% =
19. 19.295 increased by 40% =
20. 20.300 decreased by 75% =
21. 21.575 decreased by 12% =
22. 22.75 decreased by 20% =
23. 23.630 decreased by 10% =
24. 24.250 decreased by 50% =
25. 25.390 decreased by 50% =
26. 26.760 increased by 30% =
27. 27.775 decreased by 12% =
28. 28.180 increased by 5% =
29. 29.375 increased by 8% =
30. 30.768 decreased by 25% =
31. 31.180 decreased by 5% =
32. 32.70 decreased by 20% =
33. 33.428 decreased by 75% =
34. 34.260 decreased by 40% =
35. 35.260 increased by 25% =
36. 36.735 increased by 40% =
37. 37.280 increased by 75% =
38. 38.124 decreased by 25% =
39. 39.48 increased by 25% =
40. 40.752 decreased by 25% =

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