Add 12/8 and 30/21
1st number: 1 4/8, 2nd number: 1 9/21
12/8 + 30/21 is 41/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
12/8 = 12 × 21/8 × 21 = 252/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
30/21 = 30 × 8/21 × 8 = 240/168 - Add the two like fractions:
252/168 + 240/168 = 252 + 240/168 = 492/168 - 492/168 simplified gives 41/14
- So, 12/8 + 30/21 = 41/14
In mixed form: 213/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/8+30/21 12/8+60/21 12/16+30/21 12/8+30/42 36/8+30/21 12/8+90/21 12/24+30/21 12/8+30/63 60/8+30/21 12/40+30/21 84/8+30/21 12/56+30/21