4/9 cannot be reduced.
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Seven ninths minus four ninths is 1/3.
Four and four-ninths
Five-ninths must be added to four-ninths to make a whole.
Firstly, do 11 minus 4 = 7. So, now we have 7 and two ninths, minus five ninths. Much easier, 6 and 6 ninths.
Anything minus itself is zero.