Add 12/21 and 20/56
12/21 + 20/56 is 13/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
12/21 = 12 × 8/21 × 8 = 96/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
20/56 = 20 × 3/56 × 3 = 60/168 - Add the two like fractions:
96/168 + 60/168 = 96 + 60/168 = 156/168 - 156/168 simplified gives 13/14
- So, 12/21 + 20/56 = 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+20/56 12/21+40/56 12/42+20/56 36/21+20/56 12/21+60/56 12/63+20/56 60/21+20/56 84/21+20/56