Solutions by everydaycalculation.com

2142 + 260 is 815.

- 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,

260 = 2 × 760 × 7 = 14420 - Add the two like fractions:

210420 + 14420 = 210 + 14420 = 224420 - 224/420 simplified gives 815
- So, 21/42 + 2/60 = 8/15

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