Add 72/80 and 70/90
72/80 + 70/90 is 151/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 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 90 × 8 = 720,
70/90 = 70 × 8/90 × 8 = 560/720 - Add the two like fractions:
648/720 + 560/720 = 648 + 560/720 = 1208/720 - 1208/720 simplified gives 151/90
- So, 72/80 + 70/90 = 151/90
In mixed form: 161/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: