Add 12/21 and 36/7
1st number: 12/21, 2nd number: 5 1/7
12/21 + 36/7 is 40/7.
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,
12/21 = 12 × 1/21 × 1 = 12/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
36/7 = 36 × 3/7 × 3 = 108/21 - Add the two like fractions:
12/21 + 108/21 = 12 + 108/21 = 120/21 - 120/21 simplified gives 40/7
- So, 12/21 + 36/7 = 40/7
In mixed form: 55/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+36/7 12/21+72/7 12/42+36/7 12/21+36/14 36/21+36/7 12/63+36/7 12/21+36/21 60/21+36/7 12/21+36/35 84/21+36/7 12/21+36/49