Add 3/21 and 30/20
1st number: 3/21, 2nd number: 1 10/20
3/21 + 30/20 is 23/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
3/21 = 3 × 20/21 × 20 = 60/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
30/20 = 30 × 21/20 × 21 = 630/420 - Add the two like fractions:
60/420 + 630/420 = 60 + 630/420 = 690/420 - 690/420 simplified gives 23/14
- So, 3/21 + 30/20 = 23/14
In mixed form: 19/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+30/20 3/21+60/20 3/42+30/20 3/21+30/40 9/21+30/20 3/21+90/20 3/63+30/20 3/21+30/60 15/21+30/20