Add 60/21 and 30/90
1st number: 2 18/21, 2nd number: 30/90
60/21 + 30/90 is 67/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
60/21 = 60 × 30/21 × 30 = 1800/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
30/90 = 30 × 7/90 × 7 = 210/630 - Add the two like fractions:
1800/630 + 210/630 = 1800 + 210/630 = 2010/630 - 2010/630 simplified gives 67/21
- So, 60/21 + 30/90 = 67/21
In mixed form: 34/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+60/90 60/42+30/90 60/63+30/90