Add 72/80 and 30/18
1st number: 72/80, 2nd number: 1 12/18
72/80 + 30/18 is 77/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
72/80 = 72 × 9/80 × 9 = 648/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
30/18 = 30 × 40/18 × 40 = 1200/720 - Add the two like fractions:
648/720 + 1200/720 = 648 + 1200/720 = 1848/720 - 1848/720 simplified gives 77/30
- So, 72/80 + 30/18 = 77/30
In mixed form: 217/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/80+60/18 72/80+30/36 72/80+90/18 72/80+30/54 72/80+30/90