Add 15/36 and 7/21
15/36 + 7/21 is 3/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
15/36 = 15 × 7/36 × 7 = 105/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
7/21 = 7 × 12/21 × 12 = 84/252 - Add the two like fractions:
105/252 + 84/252 = 105 + 84/252 = 189/252 - 189/252 simplified gives 3/4
- So, 15/36 + 7/21 = 3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/36+7/21 15/36+14/21 15/72+7/21 15/36+7/42 45/36+7/21 15/36+7/63 75/36+7/21 15/36+35/21 15/36+49/21