Add 80/21 and 14/80, Solve 3 17/21 + 14/80 as a fraction

Add 80/21 and 14/80

1^st number: 3 17/21, 2^nd number: 14/80

80/21 + 14/80 is 3347/840.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 21 × 80 = 1680,
80/21 = 80 × 80/21 × 80 = 6400/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
14/80 = 14 × 21/80 × 21 = 294/1680
Add the two like fractions:
6400/1680 + 294/1680 = 6400 + 294/1680 = 6694/1680
6694/1680 simplified gives 3347/840
So, 80/21 + 14/80 = 3347/840
In mixed form: 3827/840

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