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40/72 + 27/72 = 67/72
72 multiplied by 3/8 is 27.
12.5 is.
five eighths
To add the fractions five ninths and negative three eighths, you need to find a common denominator. The least common multiple of nine and eight is 72. Convert both fractions to have a denominator of 72 and then add the numerators. The result is -17/72.