Add 7/10 and 42/12, Solve 7/10 + 3 6/12 as a fraction

Add 7/10 and 42/12

1^st number: 7/10, 2^nd number: 3 6/12

7/10 + 42/12 is 21/5.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 12 is 60

Next, find the equivalent fraction of both fractional numbers with denominator 60
For the 1st fraction, since 10 × 6 = 60,
7/10 = 7 × 6/10 × 6 = 42/60
Likewise, for the 2nd fraction, since 12 × 5 = 60,
42/12 = 42 × 5/12 × 5 = 210/60
Add the two like fractions:
42/60 + 210/60 = 42 + 210/60 = 252/60
252/60 simplified gives 21/5
So, 7/10 + 42/12 = 21/5
In mixed form: 41/5

MathStep (Works offline)

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