Add 7/54 and 1/21
7/54 + 1/21 is 67/378.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
7/54 = 7 × 7/54 × 7 = 49/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
1/21 = 1 × 18/21 × 18 = 18/378 - Add the two like fractions:
49/378 + 18/378 = 49 + 18/378 = 67/378 - So, 7/54 + 1/21 = 67/378
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/54+1/21 7/54+2/21 7/54+1/42 21/54+1/21 7/54+3/21 7/54+1/63 35/54+1/21 7/54+5/21 49/54+1/21 7/54+7/21