One half is nine eighteenths. Nine eighteenths minus three eighteenths is six eighteenths, which is also one third.
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We convert into eighteenths first, giving 12 eighteenths - 2 eighteenths which gives 10 eighteenths or 1 ninth.
8 is half of 18
Seven and one third minus three and one half = 23/6 or 35/6
eighty two and a half
Three-sixths minus two-sixths is one-sixth.