Add 81/9 and 54/42
1st number: 9 0/9, 2nd number: 1 12/42
81/9 + 54/42 is 72/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 9 × 14 = 126,
81/9 = 81 × 14/9 × 14 = 1134/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
54/42 = 54 × 3/42 × 3 = 162/126 - Add the two like fractions:
1134/126 + 162/126 = 1134 + 162/126 = 1296/126 - 1296/126 simplified gives 72/7
- So, 81/9 + 54/42 = 72/7
In mixed form: 102/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18+54/42 81/9+54/84 81/27+54/42 81/45+54/42 81/63+54/42