Add 81/9 and 90/72
1st number: 9 0/9, 2nd number: 1 18/72
81/9 + 90/72 is 41/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 9 × 8 = 72,
81/9 = 81 × 8/9 × 8 = 648/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
90/72 = 90 × 1/72 × 1 = 90/72 - Add the two like fractions:
648/72 + 90/72 = 648 + 90/72 = 738/72 - 738/72 simplified gives 41/4
- So, 81/9 + 90/72 = 41/4
In mixed form: 101/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18+90/72 81/27+90/72 81/45+90/72 81/63+90/72