Add 48/18 and 3/21, Solve 2 12/18 + 3/21 as a fraction

Add 48/18 and 3/21

1^st number: 2 12/18, 2^nd number: 3/21

48/18 + 3/21 is 59/21.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
48/18 = 48 × 7/18 × 7 = 336/126
Likewise, for the 2nd fraction, since 21 × 6 = 126,
3/21 = 3 × 6/21 × 6 = 18/126
Add the two like fractions:
336/126 + 18/126 = 336 + 18/126 = 354/126
354/126 simplified gives 59/21
So, 48/18 + 3/21 = 59/21
In mixed form: 217/21

MathStep (Works offline)

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