Add 1/21 and 72/12
1st number: 1/21, 2nd number: 6 0/12
1/21 + 72/12 is 127/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
72/12 = 72 × 7/12 × 7 = 504/84 - Add the two like fractions:
4/84 + 504/84 = 4 + 504/84 = 508/84 - 508/84 simplified gives 127/21
- So, 1/21 + 72/12 = 127/21
In mixed form: 61/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+72/12 1/42+72/12 1/21+72/24 3/21+72/12 1/63+72/12 1/21+72/36 5/21+72/12 1/21+72/60 7/21+72/12 1/21+72/84