Add 20/12 and 42/7, Solve 1 8/12 + 6 0/7 as a fraction

Add 20/12 and 42/7

1^st number: 1 8/12, 2^nd number: 6 0/7

20/12 + 42/7 is 23/3.

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,
42/7 = 42 × 12/7 × 12 = 504/84
Add the two like fractions:
140/84 + 504/84 = 140 + 504/84 = 644/84
644/84 simplified gives 23/3
So, 20/12 + 42/7 = 23/3
In mixed form: 72/3

MathStep (Works offline)

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