2/4 + 3/12 = 2/4 + 1/4 = 3/4
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We convert this to twelfths to give: 10 twelfths + 4 twelfths + 9 twelfths = 23 twelfths or 1 and 11 twelfths.
13
We convert the fractions to twelfths: 1 + 8 twelfths + 9 twelfths. 1 + 17 twelfths 2 and 5 twelfths.
First we convert to the same type, which is twenty-fourths: 6 twenty-fourths + 9 twenty-fourths + 10 twenty-fourths = 25 twenty-fourths or 1 and 1 twenty-fourth.
Three fourths plus five fourths is equal to eight fourths, or two whole units.