Add 70/21 and 5/12
1st number: 3 7/21, 2nd number: 5/12
70/21 + 5/12 is 15/4.
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,
70/21 = 70 × 4/21 × 4 = 280/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
5/12 = 5 × 7/12 × 7 = 35/84 - Add the two like fractions:
280/84 + 35/84 = 280 + 35/84 = 315/84 - 315/84 simplified gives 15/4
- So, 70/21 + 5/12 = 15/4
In mixed form: 33/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+10/12 70/42+5/12 70/21+5/24 70/21+15/12 70/63+5/12 70/21+5/36 70/21+25/12 70/21+5/60 70/21+35/12 70/21+5/84