Add 21/27 and 9/42
21/27 + 9/42 is 125/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 27 × 14 = 378,
21/27 = 21 × 14/27 × 14 = 294/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
9/42 = 9 × 9/42 × 9 = 81/378 - Add the two like fractions:
294/378 + 81/378 = 294 + 81/378 = 375/378 - 375/378 simplified gives 125/126
- So, 21/27 + 9/42 = 125/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27+9/42 21/27+18/42 21/54+9/42 21/27+9/84 63/27+9/42 21/27+27/42 21/81+9/42 21/27+45/42 21/27+63/42