Solutions by everydaycalculation.com

745 + 2142 is 5990.

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

LCM of 45 and 42 is**630**

Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,

745 = 7 × 1445 × 14 = 98630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,

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

98630 + 315630 = 98 + 315630 = 413630 - 413/630 simplified gives 5990
- So, 7/45 + 21/42 = 59/90

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