Two thirds is six ninths; six ninths minus four ninths is two ninths.
That is 9 and 5 ninths.
Five and four-ninths
six and eleven twentieths
six and three-fifths
13/9 or 1 and 4/9
One is bigger than the other,
Six and four fifths rounded to the nearest half is seven.
You will get zero if you subtract six ninths from six ninths.