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You have to get a common denominator to be able to do subtraction with fractions. The lowest common denominator here is 18. To make them both have a denominator of 18 you have to multiply them both. To get 7/9 into a fraction with the denominator of 18, you have to multiply both the numerator and the denominator by 2.
7 X 2 = 14
9 X 2 = 18
So 7/9 = 14/18
Then to get 1/6 into a fraction with the denominator of 18, you have to multiply both the numerator and the denominator by 3.
1 X 3 = 3
6 X 3 = 18
So 1/6 = 3/18
Then you just do simple subtraction involving fractions.
14/18 - 3/18 = 11/18
And that's your answer, 11/18
Hope that's helped!
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