Add 12/56 and 72/21
1st number: 12/56, 2nd number: 3 9/21
12/56 + 72/21 is 51/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
12/56 = 12 × 3/56 × 3 = 36/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
72/21 = 72 × 8/21 × 8 = 576/168 - Add the two like fractions:
36/168 + 576/168 = 36 + 576/168 = 612/168 - 612/168 simplified gives 51/14
- So, 12/56 + 72/21 = 51/14
In mixed form: 39/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/56+72/21 12/56+72/42 36/56+72/21 12/56+72/63 60/56+72/21 84/56+72/21