Add 21/3 and 42/7
1st number: 7 0/3, 2nd number: 6 0/7
21/3 + 42/7 is 13/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
21/3 = 21 × 7/3 × 7 = 147/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
42/7 = 42 × 3/7 × 3 = 126/21 - Add the two like fractions:
147/21 + 126/21 = 147 + 126/21 = 273/21 - 273/21 simplified gives 13/1
- So, 21/3 + 42/7 = 13/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+42/7 21/3+84/7 21/6+42/7 21/3+42/14 63/3+42/7 21/9+42/7 21/3+42/21 21/15+42/7 21/3+42/35 21/3+42/49