Add 30/8 and 3/21
1st number: 3 6/8, 2nd number: 3/21
30/8 + 3/21 is 109/28.
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,
30/8 = 30 × 21/8 × 21 = 630/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
3/21 = 3 × 8/21 × 8 = 24/168 - Add the two like fractions:
630/168 + 24/168 = 630 + 24/168 = 654/168 - 654/168 simplified gives 109/28
- So, 30/8 + 3/21 = 109/28
In mixed form: 325/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/8+3/21 30/8+6/21 30/16+3/21 30/8+3/42 90/8+3/21 30/8+9/21 30/24+3/21 30/8+3/63 30/8+15/21 30/40+3/21 30/56+3/21