Add 14/80 and 70/42, Solve 14/80 + 1 28/42 as a fraction

Add 14/80 and 70/42

1^st number: 14/80, 2^nd number: 1 28/42

14/80 + 70/42 is 221/120.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 80 × 21 = 1680,
14/80 = 14 × 21/80 × 21 = 294/1680
Likewise, for the 2nd fraction, since 42 × 40 = 1680,
70/42 = 70 × 40/42 × 40 = 2800/1680
Add the two like fractions:
294/1680 + 2800/1680 = 294 + 2800/1680 = 3094/1680
3094/1680 simplified gives 221/120
So, 14/80 + 70/42 = 221/120
In mixed form: 1101/120

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad