Solutions by everydaycalculation.com

390 + 342 is 11105.

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

LCM of 90 and 42 is**630**

Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,

390 = 3 × 790 × 7 = 21630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,

342 = 3 × 1542 × 15 = 45630 - Add the two like fractions:

21630 + 45630 = 21 + 45630 = 66630 - 66/630 simplified gives 11105
- So, 3/90 + 3/42 = 11/105

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