One and one third is the mixed number, four thirds is the simplified improper fraction.
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one third1/3
1/9 is in simplest form.
Expressed as a proper fraction in its simplest form, 1/3 + 4/9 = 7/9 or seven ninths.
Expressed as a proper fraction in its simplest form, 4/9 x 3/4 = 1/3 or one third.
7/9 + 5/9 = 12/9 = 4/3 7/9 - 5/9 = 2/9