Add 63/42 and 63/21
1st number: 1 21/42, 2nd number: 3 0/21
63/42 + 63/21 is 9/2.
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,
63/21 = 63 × 2/21 × 2 = 126/42 - Add the two like fractions:
63/42 + 126/42 = 63 + 126/42 = 189/42 - 189/42 simplified gives 9/2
- So, 63/42 + 63/21 = 9/2
In mixed form: 41/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/84+63/21 63/42+63/42