Add 63/4 and 56/21
1st number: 15 3/4, 2nd number: 2 14/21
63/4 + 56/21 is 221/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
63/4 = 63 × 21/4 × 21 = 1323/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
56/21 = 56 × 4/21 × 4 = 224/84 - Add the two like fractions:
1323/84 + 224/84 = 1323 + 224/84 = 1547/84 - 1547/84 simplified gives 221/12
- So, 63/4 + 56/21 = 221/12
In mixed form: 185/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/8+56/21 63/4+56/42 63/12+56/21 63/4+56/63 63/20+56/21 63/28+56/21