Add 3/21 and 63/7
1st number: 3/21, 2nd number: 9 0/7
3/21 + 63/7 is 64/7.
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,
63/7 = 63 × 3/7 × 3 = 189/21 - Add the two like fractions:
3/21 + 189/21 = 3 + 189/21 = 192/21 - 192/21 simplified gives 64/7
- So, 3/21 + 63/7 = 64/7
In mixed form: 91/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+63/7 3/42+63/7 3/21+63/14 9/21+63/7 3/63+63/7 3/21+63/21 15/21+63/7 3/21+63/35 3/21+63/49