One whole is nine ninths. Nine ninths minus four ninths equals five ninths.
One third is three ninths. So one ninth minus three ninths is minus two nights.
Four ninths
.31944
7/9
1 third = 3 ninths, 3 ninths - 2 ninths = 1 ninth.
1/18
11.111111111111111
It is seven ninths.
3/9 (three ninths), which can be reduced to 1/3 (one third).
5/9 minus 1/3 is 2/9
1/3=3/9 (8/9)-(3/9)=5/9