Add 8/45 and 72/80
8/45 + 72/80 is 97/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
8/45 = 8 × 16/45 × 16 = 128/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
72/80 = 72 × 9/80 × 9 = 648/720 - Add the two like fractions:
128/720 + 648/720 = 128 + 648/720 = 776/720 - 776/720 simplified gives 97/90
- So, 8/45 + 72/80 = 97/90
In mixed form: 17/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/45+72/80 8/90+72/80 24/45+72/80 40/45+72/80 56/45+72/80