Add 42/7 and 18/20, Solve 6 0/7 + 18/20 as a fraction

Add 42/7 and 18/20

1^st number: 6 0/7, 2^nd number: 18/20

42/7 + 18/20 is 69/10.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140

Next, find the equivalent fraction of both fractional numbers with denominator 140
For the 1st fraction, since 7 × 20 = 140,
42/7 = 42 × 20/7 × 20 = 840/140
Likewise, for the 2nd fraction, since 20 × 7 = 140,
18/20 = 18 × 7/20 × 7 = 126/140
Add the two like fractions:
840/140 + 126/140 = 840 + 126/140 = 966/140
966/140 simplified gives 69/10
So, 42/7 + 18/20 = 69/10
In mixed form: 69/10

MathStep (Works offline)

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