Add 81/63 and 90/54, Solve 1 18/63 + 1 36/54 as a fraction

Add 81/63 and 90/54

1^st number: 1 18/63, 2^nd number: 1 36/54

81/63 + 90/54 is 62/21.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 63 × 6 = 378,
81/63 = 81 × 6/63 × 6 = 486/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
90/54 = 90 × 7/54 × 7 = 630/378
Add the two like fractions:
486/378 + 630/378 = 486 + 630/378 = 1116/378
1116/378 simplified gives 62/21
So, 81/63 + 90/54 = 62/21
In mixed form: 220/21

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