Add 70/21 and 3/7
1st number: 3 7/21, 2nd number: 3/7
70/21 + 3/7 is 79/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
70/21 = 70 × 1/21 × 1 = 70/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
3/7 = 3 × 3/7 × 3 = 9/21 - Add the two like fractions:
70/21 + 9/21 = 70 + 9/21 = 79/21 - So, 70/21 + 3/7 = 79/21
In mixed form: 316/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+6/7 70/42+3/7 70/21+3/14 70/21+9/7 70/63+3/7 70/21+3/21 70/21+15/7 70/21+3/35 70/21+21/7 70/21+3/49