Add 21/45 and 28/4
1st number: 21/45, 2nd number: 7 0/4
21/45 + 28/4 is 112/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 4 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
21/45 = 21 × 4/45 × 4 = 84/180 - Likewise, for the 2nd fraction, since 4 × 45 = 180,
28/4 = 28 × 45/4 × 45 = 1260/180 - Add the two like fractions:
84/180 + 1260/180 = 84 + 1260/180 = 1344/180 - 1344/180 simplified gives 112/15
- So, 21/45 + 28/4 = 112/15
In mixed form: 77/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+28/4 21/45+56/4 21/90+28/4 21/45+28/8 63/45+28/4 21/45+84/4 21/45+28/12 21/45+28/20