Add 90/21 and 84/14
1st number: 4 6/21, 2nd number: 6 0/14
90/21 + 84/14 is 72/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
90/21 = 90 × 2/21 × 2 = 180/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
84/14 = 84 × 3/14 × 3 = 252/42 - Add the two like fractions:
180/42 + 252/42 = 180 + 252/42 = 432/42 - 432/42 simplified gives 72/7
- So, 90/21 + 84/14 = 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: 90/42+84/14 90/21+84/28 90/63+84/14 90/21+84/42 90/21+84/70 90/21+84/98