Add 21/28 and 28/45
21/28 + 28/45 is 247/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 45 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
21/28 = 21 × 45/28 × 45 = 945/1260 - Likewise, for the 2nd fraction, since 45 × 28 = 1260,
28/45 = 28 × 28/45 × 28 = 784/1260 - Add the two like fractions:
945/1260 + 784/1260 = 945 + 784/1260 = 1729/1260 - 1729/1260 simplified gives 247/180
- So, 21/28 + 28/45 = 247/180
In mixed form: 167/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+28/45 21/28+56/45 21/56+28/45 21/28+28/90 63/28+28/45 21/28+84/45 21/84+28/45