Add 27/16 and 5/21, Solve 1 11/16 + 5/21 as a fraction

Add 27/16 and 5/21

1^st number: 1 11/16, 2^nd number: 5/21

27/16 + 5/21 is 647/336.

Find the least common denominator or LCM of the two denominators:
LCM of 16 and 21 is 336

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 16 × 21 = 336,
27/16 = 27 × 21/16 × 21 = 567/336
Likewise, for the 2nd fraction, since 21 × 16 = 336,
5/21 = 5 × 16/21 × 16 = 80/336
Add the two like fractions:
567/336 + 80/336 = 567 + 80/336 = 647/336
So, 27/16 + 5/21 = 647/336
In mixed form: 1311/336

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