Add 36/21 and 35/5, Solve 1 15/21 + 7 0/5 as a fraction

Add 36/21 and 35/5

1^st number: 1 15/21, 2^nd number: 7 0/5

36/21 + 35/5 is 61/7.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105

Next, find the equivalent fraction of both fractional numbers with denominator 105
For the 1st fraction, since 21 × 5 = 105,
36/21 = 36 × 5/21 × 5 = 180/105
Likewise, for the 2nd fraction, since 5 × 21 = 105,
35/5 = 35 × 21/5 × 21 = 735/105
Add the two like fractions:
180/105 + 735/105 = 180 + 735/105 = 915/105
915/105 simplified gives 61/7
So, 36/21 + 35/5 = 61/7
In mixed form: 85/7

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