Add 12/21 and 36/42
12/21 + 36/42 is 10/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
12/21 = 12 × 2/21 × 2 = 24/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
36/42 = 36 × 1/42 × 1 = 36/42 - Add the two like fractions:
24/42 + 36/42 = 24 + 36/42 = 60/42 - 60/42 simplified gives 10/7
- So, 12/21 + 36/42 = 10/7
In mixed form: 13/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+36/42 12/21+72/42 12/42+36/42 12/21+36/84 36/21+36/42 12/63+36/42 60/21+36/42 84/21+36/42