Add 20/12 and 8/7, Solve 1 8/12 + 1 1/7 as a fraction

Add 20/12 and 8/7

1^st number: 1 8/12, 2^nd number: 1 1/7

20/12 + 8/7 is 59/21.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 12 × 7 = 84,
20/12 = 20 × 7/12 × 7 = 140/84
Likewise, for the 2nd fraction, since 7 × 12 = 84,
8/7 = 8 × 12/7 × 12 = 96/84
Add the two like fractions:
140/84 + 96/84 = 140 + 96/84 = 236/84
236/84 simplified gives 59/21
So, 20/12 + 8/7 = 59/21
In mixed form: 217/21

MathStep (Works offline)

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