Add 63/18 and 4/7, Solve 3 9/18 + 4/7 as a fraction

Add 63/18 and 4/7

1^st number: 3 9/18, 2^nd number: 4/7

63/18 + 4/7 is 57/14.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
63/18 = 63 × 7/18 × 7 = 441/126
Likewise, for the 2nd fraction, since 7 × 18 = 126,
4/7 = 4 × 18/7 × 18 = 72/126
Add the two like fractions:
441/126 + 72/126 = 441 + 72/126 = 513/126
513/126 simplified gives 57/14
So, 63/18 + 4/7 = 57/14
In mixed form: 41/14

MathStep (Works offline)

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