Add 30/18 and 56/21
1st number: 1 12/18, 2nd number: 2 14/21
30/18 + 56/21 is 13/3.
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,
30/18 = 30 × 7/18 × 7 = 210/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
56/21 = 56 × 6/21 × 6 = 336/126 - Add the two like fractions:
210/126 + 336/126 = 210 + 336/126 = 546/126 - 546/126 simplified gives 13/3
- So, 30/18 + 56/21 = 13/3
In mixed form: 41/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18+56/21 30/36+56/21 30/18+56/42 90/18+56/21 30/54+56/21 30/18+56/63 30/90+56/21