Add 21/12 and 18/70
1st number: 1 9/12, 2nd number: 18/70
21/12 + 18/70 is 281/140.
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,
18/70 = 18 × 6/70 × 6 = 108/420 - Add the two like fractions:
735/420 + 108/420 = 735 + 108/420 = 843/420 - 843/420 simplified gives 281/140
- So, 21/12 + 18/70 = 281/140
In mixed form: 21/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+18/70 21/12+36/70 21/24+18/70 63/12+18/70 21/12+54/70 21/36+18/70 21/12+90/70 21/60+18/70 21/84+18/70