Add 12/21 and 54/63
12/21 + 54/63 is 10/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
12/21 = 12 × 3/21 × 3 = 36/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
54/63 = 54 × 1/63 × 1 = 54/63 - Add the two like fractions:
36/63 + 54/63 = 36 + 54/63 = 90/63 - 90/63 simplified gives 10/7
- So, 12/21 + 54/63 = 10/7
In mixed form: 13/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+54/63 12/42+54/63 36/21+54/63 12/63+54/63 60/21+54/63 84/21+54/63