Add 16/12 and 21/63, Solve 1 4/12 + 21/63 as a fraction

Add 16/12 and 21/63

1^st number: 1 4/12, 2^nd number: 21/63

16/12 + 21/63 is 5/3.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 63 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 12 × 21 = 252,
16/12 = 16 × 21/12 × 21 = 336/252
Likewise, for the 2nd fraction, since 63 × 4 = 252,
21/63 = 21 × 4/63 × 4 = 84/252
Add the two like fractions:
336/252 + 84/252 = 336 + 84/252 = 420/252
420/252 simplified gives 5/3
So, 16/12 + 21/63 = 5/3
In mixed form: 12/3

MathStep (Works offline)

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