Add 72/80 and 70/9
1st number: 72/80, 2nd number: 7 7/9
72/80 + 70/9 is 781/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 9 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 9 × 80 = 720,
70/9 = 70 × 80/9 × 80 = 5600/720 - Add the two like fractions:
648/720 + 5600/720 = 648 + 5600/720 = 6248/720 - 6248/720 simplified gives 781/90
- So, 72/80 + 70/9 = 781/90
In mixed form: 861/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/80+70/18 72/80+70/27 72/80+70/45 72/80+70/63