Add 90/12 and 21/7
1st number: 7 6/12, 2nd number: 3 0/7
90/12 + 21/7 is 21/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
90/12 = 90 × 7/12 × 7 = 630/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
21/7 = 21 × 12/7 × 12 = 252/84 - Add the two like fractions:
630/84 + 252/84 = 630 + 252/84 = 882/84 - 882/84 simplified gives 21/2
- So, 90/12 + 21/7 = 21/2
In mixed form: 101/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+42/7 90/24+21/7 90/12+21/14 90/12+63/7 90/36+21/7 90/60+21/7 90/12+21/35 90/84+21/7 90/12+21/49