Add 90/27 and 21/7
1st number: 3 9/27, 2nd number: 3 0/7
90/27 + 21/7 is 19/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 7 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
90/27 = 90 × 7/27 × 7 = 630/189 - Likewise, for the 2nd fraction, since 7 × 27 = 189,
21/7 = 21 × 27/7 × 27 = 567/189 - Add the two like fractions:
630/189 + 567/189 = 630 + 567/189 = 1197/189 - 1197/189 simplified gives 19/3
- So, 90/27 + 21/7 = 19/3
In mixed form: 61/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/27+42/7 90/54+21/7 90/27+21/14 90/27+63/7 90/81+21/7 90/27+21/35 90/27+21/49