Add 12/21 and 20/6
1st number: 12/21, 2nd number: 3 2/6
12/21 + 20/6 is 82/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 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 6 × 7 = 42,
20/6 = 20 × 7/6 × 7 = 140/42 - Add the two like fractions:
24/42 + 140/42 = 24 + 140/42 = 164/42 - 164/42 simplified gives 82/21
- So, 12/21 + 20/6 = 82/21
In mixed form: 319/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+20/6 12/21+40/6 12/42+20/6 12/21+20/12 36/21+20/6 12/21+60/6 12/63+20/6 12/21+20/18 60/21+20/6 12/21+20/30 84/21+20/6 12/21+20/42