Add 21/90 and 28/8
1st number: 21/90, 2nd number: 3 4/8
21/90 + 28/8 is 56/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
21/90 = 21 × 4/90 × 4 = 84/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
28/8 = 28 × 45/8 × 45 = 1260/360 - Add the two like fractions:
84/360 + 1260/360 = 84 + 1260/360 = 1344/360 - 1344/360 simplified gives 56/15
- So, 21/90 + 28/8 = 56/15
In mixed form: 311/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+28/8 21/90+56/8 21/90+28/16 63/90+28/8 21/90+84/8 21/90+28/24 21/90+28/40 21/90+28/56