Add 30/21 and 72/8
1st number: 1 9/21, 2nd number: 9 0/8
30/21 + 72/8 is 73/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
30/21 = 30 × 8/21 × 8 = 240/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
72/8 = 72 × 21/8 × 21 = 1512/168 - Add the two like fractions:
240/168 + 1512/168 = 240 + 1512/168 = 1752/168 - 1752/168 simplified gives 73/7
- So, 30/21 + 72/8 = 73/7
In mixed form: 103/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+72/8 30/42+72/8 30/21+72/16 90/21+72/8 30/63+72/8 30/21+72/24 30/21+72/40 30/21+72/56