Add 12/21 and 90/27
1st number: 12/21, 2nd number: 3 9/27
12/21 + 90/27 is 82/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
12/21 = 12 × 9/21 × 9 = 108/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
90/27 = 90 × 7/27 × 7 = 630/189 - Add the two like fractions:
108/189 + 630/189 = 108 + 630/189 = 738/189 - 738/189 simplified gives 82/21
- So, 12/21 + 90/27 = 82/21
In mixed form: 319/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+90/27 12/42+90/27 12/21+90/54 36/21+90/27 12/63+90/27 12/21+90/81 60/21+90/27 84/21+90/27