Add 1/21 and 28/36
1/21 + 28/36 is 52/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
1/21 = 1 × 12/21 × 12 = 12/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
28/36 = 28 × 7/36 × 7 = 196/252 - Add the two like fractions:
12/252 + 196/252 = 12 + 196/252 = 208/252 - 208/252 simplified gives 52/63
- So, 1/21 + 28/36 = 52/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+28/36 1/21+56/36 1/42+28/36 1/21+28/72 3/21+28/36 1/21+84/36 1/63+28/36 5/21+28/36 7/21+28/36