Add 21/28 and 42/9
1st number: 21/28, 2nd number: 4 6/9
21/28 + 42/9 is 65/12.
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,
42/9 = 42 × 28/9 × 28 = 1176/252 - Add the two like fractions:
189/252 + 1176/252 = 189 + 1176/252 = 1365/252 - 1365/252 simplified gives 65/12
- So, 21/28 + 42/9 = 65/12
In mixed form: 55/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+42/9 21/28+84/9 21/56+42/9 21/28+42/18 63/28+42/9 21/84+42/9 21/28+42/27 21/28+42/45 21/28+42/63