Add 63/42 and 8/21
1st number: 1 21/42, 2nd number: 8/21
63/42 + 8/21 is 79/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
63/42 = 63 × 1/42 × 1 = 63/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
8/21 = 8 × 2/21 × 2 = 16/42 - Add the two like fractions:
63/42 + 16/42 = 63 + 16/42 = 79/42 - So, 63/42 + 8/21 = 79/42
In mixed form: 137/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42+16/21 63/84+8/21 63/42+8/42 63/42+24/21 63/42+8/63 63/42+40/21 63/42+56/21