Add 81/36 and 16/21, Solve 2 9/36 + 16/21 as a fraction

Add 81/36 and 16/21

1^st number: 2 9/36, 2^nd number: 16/21

81/36 + 16/21 is 253/84.

Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 36 × 7 = 252,
81/36 = 81 × 7/36 × 7 = 567/252
Likewise, for the 2nd fraction, since 21 × 12 = 252,
16/21 = 16 × 12/21 × 12 = 192/252
Add the two like fractions:
567/252 + 192/252 = 567 + 192/252 = 759/252
759/252 simplified gives 253/84
So, 81/36 + 16/21 = 253/84
In mixed form: 31/84

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