Add 18/12 and 21/70
1st number: 1 6/12, 2nd number: 21/70
18/12 + 21/70 is 9/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 70 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 12 × 35 = 420,
18/12 = 18 × 35/12 × 35 = 630/420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,
21/70 = 21 × 6/70 × 6 = 126/420 - Add the two like fractions:
630/420 + 126/420 = 630 + 126/420 = 756/420 - 756/420 simplified gives 9/5
- So, 18/12 + 21/70 = 9/5
In mixed form: 14/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12+21/70 18/12+42/70 18/24+21/70 54/12+21/70 18/12+63/70 18/36+21/70 90/12+21/70 18/60+21/70 18/84+21/70