Add 70/12 and 9/21
1st number: 5 10/12, 2nd number: 9/21
70/12 + 9/21 is 263/42.
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,
70/12 = 70 × 7/12 × 7 = 490/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
9/21 = 9 × 4/21 × 4 = 36/84 - Add the two like fractions:
490/84 + 36/84 = 490 + 36/84 = 526/84 - 526/84 simplified gives 263/42
- So, 70/12 + 9/21 = 263/42
In mixed form: 611/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/12+18/21 70/24+9/21 70/12+9/42 70/12+27/21 70/36+9/21 70/12+9/63 70/12+45/21 70/60+9/21 70/12+63/21 70/84+9/21