Solutions by everydaycalculation.com

980 + 2145 is 139240.

- 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,

980 = 9 × 980 × 9 = 81720 - Likewise, for the 2nd fraction, since 45 × 16 = 720,

2145 = 21 × 1645 × 16 = 336720 - Add the two like fractions:

81720 + 336720 = 81 + 336720 = 417720 - 417/720 simplified gives 139240
- So, 9/80 + 21/45 = 139/240

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