Add 36/3 and 90/21, Solve 12 0/3 + 4 6/21 as a fraction

Add 36/3 and 90/21

1^st number: 12 0/3, 2^nd number: 4 6/21

36/3 + 90/21 is 114/7.

Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21

Next, find the equivalent fraction of both fractional numbers with denominator 21
For the 1st fraction, since 3 × 7 = 21,
36/3 = 36 × 7/3 × 7 = 252/21
Likewise, for the 2nd fraction, since 21 × 1 = 21,
90/21 = 90 × 1/21 × 1 = 90/21
Add the two like fractions:
252/21 + 90/21 = 252 + 90/21 = 342/21
342/21 simplified gives 114/7
So, 36/3 + 90/21 = 114/7
In mixed form: 162/7

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