Add 90/21 and 60/9
1st number: 4 6/21, 2nd number: 6 6/9
90/21 + 60/9 is 230/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
90/21 = 90 × 3/21 × 3 = 270/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
60/9 = 60 × 7/9 × 7 = 420/63 - Add the two like fractions:
270/63 + 420/63 = 270 + 420/63 = 690/63 - 690/63 simplified gives 230/21
- So, 90/21 + 60/9 = 230/21
In mixed form: 1020/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+60/9 90/21+60/18 90/63+60/9 90/21+60/27 90/21+60/45 90/21+60/63