Solutions by everydaycalculation.com

2142 + 290 is 4790.

- 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,

290 = 2 × 790 × 7 = 14630 - Add the two like fractions:

315630 + 14630 = 315 + 14630 = 329630 - 329/630 simplified gives 4790
- So, 21/42 + 2/90 = 47/90

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