Add 72/42 and 30/9
1st number: 1 30/42, 2nd number: 3 3/9
72/42 + 30/9 is 106/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
72/42 = 72 × 3/42 × 3 = 216/126 - Likewise, for the 2nd fraction, since 9 × 14 = 126,
30/9 = 30 × 14/9 × 14 = 420/126 - Add the two like fractions:
216/126 + 420/126 = 216 + 420/126 = 636/126 - 636/126 simplified gives 106/21
- So, 72/42 + 30/9 = 106/21
In mixed form: 51/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42+60/9 72/84+30/9 72/42+30/18 72/42+90/9 72/42+30/27 72/42+30/45 72/42+30/63