Solutions by everydaycalculation.com

190 + 2142 is 2345.

- 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,

190 = 1 × 790 × 7 = 7630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,

2142 = 21 × 1542 × 15 = 315630 - Add the two like fractions:

7630 + 315630 = 7 + 315630 = 322630 - 322/630 simplified gives 2345
- So, 1/90 + 21/42 = 23/45

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