Add 21/12 and 8/70
1st number: 1 9/12, 2nd number: 8/70
21/12 + 8/70 is 261/140.
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,
8/70 = 8 × 6/70 × 6 = 48/420 - Add the two like fractions:
735/420 + 48/420 = 735 + 48/420 = 783/420 - 783/420 simplified gives 261/140
- So, 21/12 + 8/70 = 261/140
In mixed form: 1121/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+8/70 21/12+16/70 21/24+8/70 63/12+8/70 21/12+24/70 21/36+8/70 21/12+40/70 21/60+8/70 21/12+56/70 21/84+8/70