Add 27/21 and 70/12
1st number: 1 6/21, 2nd number: 5 10/12
27/21 + 70/12 is 299/42.
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,
27/21 = 27 × 4/21 × 4 = 108/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
70/12 = 70 × 7/12 × 7 = 490/84 - Add the two like fractions:
108/84 + 490/84 = 108 + 490/84 = 598/84 - 598/84 simplified gives 299/42
- So, 27/21 + 70/12 = 299/42
In mixed form: 75/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+70/12 27/42+70/12 27/21+70/24 81/21+70/12 27/63+70/12 27/21+70/36 27/21+70/60 27/21+70/84