Add 21/12 and 1/70
1st number: 1 9/12, 2nd number: 1/70
21/12 + 1/70 is 247/140.
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,
1/70 = 1 × 6/70 × 6 = 6/420 - Add the two like fractions:
735/420 + 6/420 = 735 + 6/420 = 741/420 - 741/420 simplified gives 247/140
- So, 21/12 + 1/70 = 247/140
In mixed form: 1107/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+1/70 21/12+2/70 21/24+1/70 63/12+1/70 21/12+3/70 21/36+1/70 21/12+5/70 21/60+1/70 21/12+7/70 21/84+1/70