Add 21/36 and 3/15
21/36 + 3/15 is 47/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 15 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
21/36 = 21 × 5/36 × 5 = 105/180 - Likewise, for the 2nd fraction, since 15 × 12 = 180,
3/15 = 3 × 12/15 × 12 = 36/180 - Add the two like fractions:
105/180 + 36/180 = 105 + 36/180 = 141/180 - 141/180 simplified gives 47/60
- So, 21/36 + 3/15 = 47/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36+3/15 21/36+6/15 21/72+3/15 21/36+3/30 63/36+3/15 21/36+9/15 21/36+3/45 21/36+3/75 21/36+21/15