Add 6/8 and 72/21
1st number: 6/8, 2nd number: 3 9/21
6/8 + 72/21 is 117/28.
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,
6/8 = 6 × 21/8 × 21 = 126/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
72/21 = 72 × 8/21 × 8 = 576/168 - Add the two like fractions:
126/168 + 576/168 = 126 + 576/168 = 702/168 - 702/168 simplified gives 117/28
- So, 6/8 + 72/21 = 117/28
In mixed form: 45/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/8+72/21 6/16+72/21 6/8+72/42 18/8+72/21 6/24+72/21 6/8+72/63 30/8+72/21 6/40+72/21 42/8+72/21 6/56+72/21