Add 21/12 and 5/15
1st number: 1 9/12, 2nd number: 5/15
21/12 + 5/15 is 25/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
5/15 = 5 × 4/15 × 4 = 20/60 - Add the two like fractions:
105/60 + 20/60 = 105 + 20/60 = 125/60 - 125/60 simplified gives 25/12
- So, 21/12 + 5/15 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+5/15 21/12+10/15 21/24+5/15 21/12+5/30 63/12+5/15 21/36+5/15 21/12+5/45 21/12+25/15 21/60+5/15 21/12+5/75 21/12+35/15 21/84+5/15