Add 20/12 and 27/21
1st number: 1 8/12, 2nd number: 1 6/21
20/12 + 27/21 is 62/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
20/12 = 20 × 7/12 × 7 = 140/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
27/21 = 27 × 4/21 × 4 = 108/84 - Add the two like fractions:
140/84 + 108/84 = 140 + 108/84 = 248/84 - 248/84 simplified gives 62/21
- So, 20/12 + 27/21 = 62/21
In mixed form: 220/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+27/21 20/12+54/21 20/24+27/21 20/12+27/42 60/12+27/21 20/12+81/21 20/36+27/21 20/12+27/63 20/60+27/21 20/84+27/21