To add fractions you must have the same denominator.
1/15 + 4/9
45 is the common denominator here and now you need forms of one to get the denominators the same
3*1/3*15 + 5*4/5*9
3/45 + 20/45
= 23/45
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Four ninths
It is seven ninths.
5 and 5/9
One-third plus three-ninths is 2/3.7/9
Five-ninths must be added to four-ninths to make a whole.