Add 21/18 and 70/49
1st number: 1 3/18, 2nd number: 1 21/49
21/18 + 70/49 is 109/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 49 is 882
Next, find the equivalent fraction of both fractional numbers with denominator 882 - For the 1st fraction, since 18 × 49 = 882,
21/18 = 21 × 49/18 × 49 = 1029/882 - Likewise, for the 2nd fraction, since 49 × 18 = 882,
70/49 = 70 × 18/49 × 18 = 1260/882 - Add the two like fractions:
1029/882 + 1260/882 = 1029 + 1260/882 = 2289/882 - 2289/882 simplified gives 109/42
- So, 21/18 + 70/49 = 109/42
In mixed form: 225/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+70/49 21/36+70/49 21/18+70/98 63/18+70/49 21/54+70/49 21/90+70/49