One half is nine eighteenths. Nine eighteenths minus three eighteenths is six eighteenths, which is also one third.
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.
1.75 or one and three quarters