Add 96/21 and 21/81, Solve 4 12/21 + 21/81 as a fraction

Add 96/21 and 21/81

1^st number: 4 12/21, 2^nd number: 21/81

96/21 + 21/81 is 913/189.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567

Next, find the equivalent fraction of both fractional numbers with denominator 567
For the 1st fraction, since 21 × 27 = 567,
96/21 = 96 × 27/21 × 27 = 2592/567
Likewise, for the 2nd fraction, since 81 × 7 = 567,
21/81 = 21 × 7/81 × 7 = 147/567
Add the two like fractions:
2592/567 + 147/567 = 2592 + 147/567 = 2739/567
2739/567 simplified gives 913/189
So, 96/21 + 21/81 = 913/189
In mixed form: 4157/189

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