Add 7/21 and 7/54
7/21 + 7/54 is 25/54.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
7/21 = 7 × 18/21 × 18 = 126/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
7/54 = 7 × 7/54 × 7 = 49/378 - Add the two like fractions:
126/378 + 49/378 = 126 + 49/378 = 175/378 - 175/378 simplified gives 25/54
- So, 7/21 + 7/54 = 25/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+7/54 7/21+14/54 7/42+7/54 7/21+21/54 7/63+7/54 35/21+7/54 7/21+35/54 49/21+7/54 7/21+49/54