Add 35/12 and 70/21
1st number: 2 11/12, 2nd number: 3 7/21
35/12 + 70/21 is 25/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
35/12 = 35 × 7/12 × 7 = 245/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
70/21 = 70 × 4/21 × 4 = 280/84 - Add the two like fractions:
245/84 + 280/84 = 245 + 280/84 = 525/84 - 525/84 simplified gives 25/4
- So, 35/12 + 70/21 = 25/4
In mixed form: 61/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/12+70/21 35/24+70/21 35/12+70/42 35/36+70/21 35/12+70/63 35/60+70/21 35/84+70/21