Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 38 · 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. 1.580 decreased by 25% =
2. 2.290 decreased by 30% =
3. 3.100 decreased by 10% =
4. 4.532 decreased by 75% =
5. 5.120 decreased by 75% =
6. 6.780 increased by 15% =
7. 7.155 decreased by 20% =
8. 8.514 increased by 50% =
9. 9.220 decreased by 35% =
10. 10.400 decreased by 5% =
11. 11.780 increased by 5% =
12. 12.585 decreased by 20% =
13. 13.680 decreased by 35% =
14. 14.580 decreased by 20% =
15. 15.490 increased by 20% =
16. 16.245 increased by 40% =
17. 17.228 decreased by 75% =
18. 18.50 decreased by 30% =
19. 19.215 decreased by 20% =
20. 20.190 increased by 30% =
21. 21.175 decreased by 12% =
22. 22.800 decreased by 5% =
23. 23.145 increased by 60% =
24. 24.700 increased by 10% =
25. 25.375 decreased by 20% =
26. 26.140 decreased by 35% =
27. 27.475 increased by 12% =
28. 28.150 decreased by 30% =
29. 29.165 increased by 60% =
30. 30.332 increased by 75% =
31. 31.340 decreased by 15% =
32. 32.120 decreased by 15% =
33. 33.120 increased by 15% =
34. 34.95 decreased by 20% =
35. 35.600 decreased by 10% =
36. 36.520 decreased by 30% =
37. 37.220 increased by 35% =
38. 38.420 decreased by 15% =
39. 39.704 decreased by 50% =
40. 40.116 increased by 75% =

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