Solutions by everydaycalculation.com

2142 + 560 is 712.

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

LCM of 42 and 60 is**420**

Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,

2142 = 21 × 1042 × 10 = 210420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,

560 = 5 × 760 × 7 = 35420 - Add the two like fractions:

210420 + 35420 = 210 + 35420 = 245420 - 245/420 simplified gives 712
- So, 21/42 + 5/60 = 7/12

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