Add 12/9 and 21/70
1st number: 1 3/9, 2nd number: 21/70
12/9 + 21/70 is 49/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 9 × 70 = 630,
12/9 = 12 × 70/9 × 70 = 840/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
21/70 = 21 × 9/70 × 9 = 189/630 - Add the two like fractions:
840/630 + 189/630 = 840 + 189/630 = 1029/630 - 1029/630 simplified gives 49/30
- So, 12/9 + 21/70 = 49/30
In mixed form: 119/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/9+21/70 12/9+42/70 12/18+21/70 36/9+21/70 12/9+63/70 12/27+21/70 60/9+21/70 12/45+21/70 84/9+21/70 12/63+21/70