Add 72/21 and 27/7
1st number: 3 9/21, 2nd number: 3 6/7
72/21 + 27/7 is 51/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
72/21 = 72 × 1/21 × 1 = 72/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
27/7 = 27 × 3/7 × 3 = 81/21 - Add the two like fractions:
72/21 + 81/21 = 72 + 81/21 = 153/21 - 153/21 simplified gives 51/7
- So, 72/21 + 27/7 = 51/7
In mixed form: 72/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+54/7 72/42+27/7 72/21+27/14 72/21+81/7 72/63+27/7 72/21+27/21 72/21+27/35 72/21+27/49