Add 21/8 and 72/27
1st number: 2 5/8, 2nd number: 2 18/27
21/8 + 72/27 is 127/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 27 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 8 × 27 = 216,
21/8 = 21 × 27/8 × 27 = 567/216 - Likewise, for the 2nd fraction, since 27 × 8 = 216,
72/27 = 72 × 8/27 × 8 = 576/216 - Add the two like fractions:
567/216 + 576/216 = 567 + 576/216 = 1143/216 - 1143/216 simplified gives 127/24
- So, 21/8 + 72/27 = 127/24
In mixed form: 57/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+72/27 21/16+72/27 21/8+72/54 63/8+72/27 21/24+72/27 21/8+72/81 21/40+72/27 21/56+72/27