Solutions by everydaycalculation.com

78 + 19 is 7172.

- Find the least common denominator or LCM of the two denominators:

LCM of 8 and 9 is**72**

Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,

78 = 7 × 98 × 9 = 6372 - Likewise, for the 2nd fraction, since 9 × 8 = 72,

19 = 1 × 89 × 8 = 872 - Add the two like fractions:

6372 + 872 = 63 + 872 = 7172 - So, 7/8 + 1/9 = 71/72

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