Add 3/21 and 8/7
1st number: 3/21, 2nd number: 1 1/7
3/21 + 8/7 is 9/7.
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,
3/21 = 3 × 1/21 × 1 = 3/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
8/7 = 8 × 3/7 × 3 = 24/21 - Add the two like fractions:
3/21 + 24/21 = 3 + 24/21 = 27/21 - 27/21 simplified gives 9/7
- So, 3/21 + 8/7 = 9/7
In mixed form: 12/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+8/7 3/21+16/7 3/42+8/7 3/21+8/14 9/21+8/7 3/21+24/7 3/63+8/7 3/21+8/21 15/21+8/7 3/21+40/7 3/21+8/35 3/21+56/7 3/21+8/49