Add 70/21 and 30/6, Solve 3 7/21 + 5 0/6 as a fraction

Add 70/21 and 30/6

1^st number: 3 7/21, 2^nd number: 5 0/6

70/21 + 30/6 is 25/3.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 21 × 2 = 42,
70/21 = 70 × 2/21 × 2 = 140/42
Likewise, for the 2nd fraction, since 6 × 7 = 42,
30/6 = 30 × 7/6 × 7 = 210/42
Add the two like fractions:
140/42 + 210/42 = 140 + 210/42 = 350/42
350/42 simplified gives 25/3
So, 70/21 + 30/6 = 25/3
In mixed form: 81/3

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