Add 1/21 and 12/8
1st number: 1/21, 2nd number: 1 4/8
1/21 + 12/8 is 65/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
1/21 = 1 × 8/21 × 8 = 8/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
12/8 = 12 × 21/8 × 21 = 252/168 - Add the two like fractions:
8/168 + 252/168 = 8 + 252/168 = 260/168 - 260/168 simplified gives 65/42
- So, 1/21 + 12/8 = 65/42
In mixed form: 123/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+12/8 1/21+24/8 1/42+12/8 1/21+12/16 3/21+12/8 1/21+36/8 1/63+12/8 1/21+12/24 5/21+12/8 1/21+60/8 1/21+12/40 7/21+12/8 1/21+84/8 1/21+12/56