Solutions by everydaycalculation.com

2142 + 590 is 59.

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

LCM of 42 and 90 is**630**

Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,

2142 = 21 × 1542 × 15 = 315630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,

590 = 5 × 790 × 7 = 35630 - Add the two like fractions:

315630 + 35630 = 315 + 35630 = 350630 - 350/630 simplified gives 59
- So, 21/42 + 5/90 = 5/9

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