Add 12/42 and 90/7, Solve 12/42 + 12 6/7 as a fraction

Add 12/42 and 90/7

1^st number: 12/42, 2^nd number: 12 6/7

12/42 + 90/7 is 92/7.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 42 × 1 = 42,
12/42 = 12 × 1/42 × 1 = 12/42
Likewise, for the 2nd fraction, since 7 × 6 = 42,
90/7 = 90 × 6/7 × 6 = 540/42
Add the two like fractions:
12/42 + 540/42 = 12 + 540/42 = 552/42
552/42 simplified gives 92/7
So, 12/42 + 90/7 = 92/7
In mixed form: 131/7

MathStep (Works offline)

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