Solutions by everydaycalculation.com

1^{st} number: 1/3, 2^{nd} number: 1 1/7

13 + 87 is 3121.

- Find the least common denominator or LCM of the two denominators:

LCM of 3 and 7 is**21**

Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,

13 = 1 × 73 × 7 = 721 - Likewise, for the 2nd fraction, since 7 × 3 = 21,

87 = 8 × 37 × 3 = 2421 - Add the two like fractions:

721 + 2421 = 7 + 2421 = 3121 - So, 1/3 + 8/7 = 31/21

In mixed form: 11021

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