Add 4/54 and 21/42
4/54 + 21/42 is 31/54.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
4/54 = 4 × 7/54 × 7 = 28/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
21/42 = 21 × 9/42 × 9 = 189/378 - Add the two like fractions:
28/378 + 189/378 = 28 + 189/378 = 217/378 - 217/378 simplified gives 31/54
- So, 4/54 + 21/42 = 31/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/54+21/42 4/54+21/84 12/54+21/42 4/54+63/42 20/54+21/42 28/54+21/42