Add 14/12 and 20/21
1st number: 1 2/12, 2nd number: 20/21
14/12 + 20/21 is 89/42.
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,
14/12 = 14 × 7/12 × 7 = 98/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Add the two like fractions:
98/84 + 80/84 = 98 + 80/84 = 178/84 - 178/84 simplified gives 89/42
- So, 14/12 + 20/21 = 89/42
In mixed form: 25/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/12+20/21 14/12+40/21 14/24+20/21 14/12+20/42 42/12+20/21 14/12+60/21 14/36+20/21 14/12+20/63 70/12+20/21 14/60+20/21 98/12+20/21 14/84+20/21