Add 10/21 and 21/63
10/21 + 21/63 is 17/21.
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,
10/21 = 10 × 3/21 × 3 = 30/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
21/63 = 21 × 1/63 × 1 = 21/63 - Add the two like fractions:
30/63 + 21/63 = 30 + 21/63 = 51/63 - 51/63 simplified gives 17/21
- So, 10/21 + 21/63 = 17/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+21/63 10/21+42/63 10/42+21/63 30/21+21/63 10/63+21/63 50/21+21/63 70/21+21/63