Solutions by everydaycalculation.com

1584 + 4280 is 197280.

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

LCM of 84 and 80 is**1680**

Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,

1584 = 15 × 2084 × 20 = 3001680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,

4280 = 42 × 2180 × 21 = 8821680 - Add the two like fractions:

3001680 + 8821680 = 300 + 8821680 = 11821680 - 1182/1680 simplified gives 197280
- So, 15/84 + 42/80 = 197/280

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