Add 90/21 and 9/7
1st number: 4 6/21, 2nd number: 1 2/7
90/21 + 9/7 is 39/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
90/21 = 90 × 1/21 × 1 = 90/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
9/7 = 9 × 3/7 × 3 = 27/21 - Add the two like fractions:
90/21 + 27/21 = 90 + 27/21 = 117/21 - 117/21 simplified gives 39/7
- So, 90/21 + 9/7 = 39/7
In mixed form: 54/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+18/7 90/42+9/7 90/21+9/14 90/21+27/7 90/63+9/7 90/21+9/21 90/21+45/7 90/21+9/35 90/21+63/7 90/21+9/49