Add 3/21 and 75/20
1st number: 3/21, 2nd number: 3 15/20
3/21 + 75/20 is 109/28.
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,
75/20 = 75 × 21/20 × 21 = 1575/420 - Add the two like fractions:
60/420 + 1575/420 = 60 + 1575/420 = 1635/420 - 1635/420 simplified gives 109/28
- So, 3/21 + 75/20 = 109/28
In mixed form: 325/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+75/20 3/42+75/20 3/21+75/40 9/21+75/20 3/63+75/20 3/21+75/60 15/21+75/20