Add 27/60 and 80/21
1st number: 27/60, 2nd number: 3 17/21
27/60 + 80/21 is 1789/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
27/60 = 27 × 7/60 × 7 = 189/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
80/21 = 80 × 20/21 × 20 = 1600/420 - Add the two like fractions:
189/420 + 1600/420 = 189 + 1600/420 = 1789/420 - So, 27/60 + 80/21 = 1789/420
In mixed form: 4109/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/60+80/21 27/60+80/42 81/60+80/21 27/60+80/63