Add 15/28 and 5/12
15/28 + 5/12 is 20/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
15/28 = 15 × 3/28 × 3 = 45/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
5/12 = 5 × 7/12 × 7 = 35/84 - Add the two like fractions:
45/84 + 35/84 = 45 + 35/84 = 80/84 - 80/84 simplified gives 20/21
- So, 15/28 + 5/12 = 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28+5/12 15/28+10/12 15/56+5/12 15/28+5/24 45/28+5/12 15/28+15/12 15/84+5/12 15/28+5/36 75/28+5/12 15/28+25/12 15/28+5/60 15/28+35/12 15/28+5/84