Solutions by everydaycalculation.com

2780 + 745 is 71144.

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

LCM of 80 and 45 is**720**

Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,

2780 = 27 × 980 × 9 = 243720 - Likewise, for the 2nd fraction, since 45 × 16 = 720,

745 = 7 × 1645 × 16 = 112720 - Add the two like fractions:

243720 + 112720 = 243 + 112720 = 355720 - 355/720 simplified gives 71144
- So, 27/80 + 7/45 = 71/144

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