Solutions by everydaycalculation.com

2142 + 456 is 47.

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

LCM of 42 and 56 is**168**

Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,

2142 = 21 × 442 × 4 = 84168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,

456 = 4 × 356 × 3 = 12168 - Add the two like fractions:

84168 + 12168 = 84 + 12168 = 96168 - 96/168 simplified gives 47
- So, 21/42 + 4/56 = 4/7

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