Add 21/63 and 12/21
21/63 + 12/21 is 19/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
21/63 = 21 × 1/63 × 1 = 21/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
12/21 = 12 × 3/21 × 3 = 36/63 - Add the two like fractions:
21/63 + 36/63 = 21 + 36/63 = 57/63 - 57/63 simplified gives 19/21
- So, 21/63 + 12/21 = 19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63+12/21 21/63+24/21 21/63+12/42 21/63+36/21 21/63+12/63 21/63+60/21 21/63+84/21