Add 21/28 and 1/9
21/28 + 1/9 is 31/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
21/28 = 21 × 9/28 × 9 = 189/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
1/9 = 1 × 28/9 × 28 = 28/252 - Add the two like fractions:
189/252 + 28/252 = 189 + 28/252 = 217/252 - 217/252 simplified gives 31/36
- So, 21/28 + 1/9 = 31/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+1/9 21/28+2/9 21/56+1/9 21/28+1/18 63/28+1/9 21/28+3/9 21/84+1/9 21/28+1/27 21/28+5/9 21/28+1/45 21/28+7/9 21/28+1/63