Add 12/21 and 27/63
12/21 + 27/63 is 1/1.
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,
27/63 = 27 × 1/63 × 1 = 27/63 - Add the two like fractions:
36/63 + 27/63 = 36 + 27/63 = 63/63 - 63/63 simplified gives 1/1
- So, 12/21 + 27/63 = 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+27/63 12/21+54/63 12/42+27/63 36/21+27/63 12/21+81/63 12/63+27/63 60/21+27/63 84/21+27/63