Add 21/18 and 4/28
1st number: 1 3/18, 2nd number: 4/28
21/18 + 4/28 is 55/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 18 × 14 = 252,
21/18 = 21 × 14/18 × 14 = 294/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
4/28 = 4 × 9/28 × 9 = 36/252 - Add the two like fractions:
294/252 + 36/252 = 294 + 36/252 = 330/252 - 330/252 simplified gives 55/42
- So, 21/18 + 4/28 = 55/42
In mixed form: 113/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+4/28 21/18+8/28 21/36+4/28 21/18+4/56 63/18+4/28 21/18+12/28 21/54+4/28 21/18+4/84 21/18+20/28 21/90+4/28