Solutions by everydaycalculation.com

2142 + 2570 is 67.

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

LCM of 42 and 70 is**210**

Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,

2142 = 21 × 542 × 5 = 105210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,

2570 = 25 × 370 × 3 = 75210 - Add the two like fractions:

105210 + 75210 = 105 + 75210 = 180210 - 180/210 simplified gives 67
- So, 21/42 + 25/70 = 6/7

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