Add 12/21 and 30/8
1st number: 12/21, 2nd number: 3 6/8
12/21 + 30/8 is 121/28.
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,
12/21 = 12 × 8/21 × 8 = 96/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
30/8 = 30 × 21/8 × 21 = 630/168 - Add the two like fractions:
96/168 + 630/168 = 96 + 630/168 = 726/168 - 726/168 simplified gives 121/28
- So, 12/21 + 30/8 = 121/28
In mixed form: 49/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+30/8 12/21+60/8 12/42+30/8 12/21+30/16 36/21+30/8 12/21+90/8 12/63+30/8 12/21+30/24 60/21+30/8 12/21+30/40 84/21+30/8 12/21+30/56