Add 70/30 and 21/12
1st number: 2 10/30, 2nd number: 1 9/12
70/30 + 21/12 is 49/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
70/30 = 70 × 2/30 × 2 = 140/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Add the two like fractions:
140/60 + 105/60 = 140 + 105/60 = 245/60 - 245/60 simplified gives 49/12
- So, 70/30 + 21/12 = 49/12
In mixed form: 41/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/30+42/12 70/60+21/12 70/30+21/24 70/30+63/12 70/90+21/12 70/30+21/36 70/30+21/60 70/30+21/84