Add 21/12 and 7/70
1st number: 1 9/12, 2nd number: 7/70
21/12 + 7/70 is 37/20.
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,
21/12 = 21 × 35/12 × 35 = 735/420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,
7/70 = 7 × 6/70 × 6 = 42/420 - Add the two like fractions:
735/420 + 42/420 = 735 + 42/420 = 777/420 - 777/420 simplified gives 37/20
- So, 21/12 + 7/70 = 37/20
In mixed form: 117/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+7/70 21/12+14/70 21/24+7/70 63/12+7/70 21/12+21/70 21/36+7/70 21/12+35/70 21/60+7/70 21/12+49/70 21/84+7/70