To add or subtract fractions, you need to put them over a common denominator, which should be 9 in this case. To convert 3 into an improper fraction over 9, multiply 3 by 9/9
3 = 3/1 * 9/9 = 27/9
So now we can subtract 1/9 from 3:
27/9 - 1/9 = 26/9 = 18/9 + 8/9 = 2 8/9
You might also try looking at the following tutorial on fractions:
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