Add 21/7 and 12/16, Solve 3 0/7 + 12/16 as a fraction

Add 21/7 and 12/16

1^st number: 3 0/7, 2^nd number: 12/16

21/7 + 12/16 is 15/4.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 16 is 112

Next, find the equivalent fraction of both fractional numbers with denominator 112
For the 1st fraction, since 7 × 16 = 112,
21/7 = 21 × 16/7 × 16 = 336/112
Likewise, for the 2nd fraction, since 16 × 7 = 112,
12/16 = 12 × 7/16 × 7 = 84/112
Add the two like fractions:
336/112 + 84/112 = 336 + 84/112 = 420/112
420/112 simplified gives 15/4
So, 21/7 + 12/16 = 15/4
In mixed form: 33/4

MathStep (Works offline)

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