Add 10/21 and 63/42
1st number: 10/21, 2nd number: 1 21/42
10/21 + 63/42 is 83/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
10/21 = 10 × 2/21 × 2 = 20/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
63/42 = 63 × 1/42 × 1 = 63/42 - Add the two like fractions:
20/42 + 63/42 = 20 + 63/42 = 83/42 - So, 10/21 + 63/42 = 83/42
In mixed form: 141/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+63/42 10/42+63/42 10/21+63/84 30/21+63/42 10/63+63/42 50/21+63/42 70/21+63/42