Add 12/54 and 49/21
1st number: 12/54, 2nd number: 2 7/21
12/54 + 49/21 is 23/9.
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,
12/54 = 12 × 7/54 × 7 = 84/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
49/21 = 49 × 18/21 × 18 = 882/378 - Add the two like fractions:
84/378 + 882/378 = 84 + 882/378 = 966/378 - 966/378 simplified gives 23/9
- So, 12/54 + 49/21 = 23/9
In mixed form: 25/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/54+49/21 12/54+98/21 12/54+49/42 36/54+49/21 12/54+49/63 60/54+49/21 84/54+49/21