Add 8/42 and 21/27
8/42 + 21/27 is 61/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
8/42 = 8 × 9/42 × 9 = 72/378 - Likewise, for the 2nd fraction, since 27 × 14 = 378,
21/27 = 21 × 14/27 × 14 = 294/378 - Add the two like fractions:
72/378 + 294/378 = 72 + 294/378 = 366/378 - 366/378 simplified gives 61/63
- So, 8/42 + 21/27 = 61/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/42+21/27 8/42+42/27 8/84+21/27 8/42+21/54 24/42+21/27 8/42+63/27 8/42+21/81 40/42+21/27 56/42+21/27