Add 7/18 and 56/21
1st number: 7/18, 2nd number: 2 14/21
7/18 + 56/21 is 55/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
7/18 = 7 × 7/18 × 7 = 49/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
56/21 = 56 × 6/21 × 6 = 336/126 - Add the two like fractions:
49/126 + 336/126 = 49 + 336/126 = 385/126 - 385/126 simplified gives 55/18
- So, 7/18 + 56/21 = 55/18
In mixed form: 31/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18+56/21 7/36+56/21 7/18+56/42 21/18+56/21 7/54+56/21 7/18+56/63 35/18+56/21 7/90+56/21 49/18+56/21