Add 12/4 and 63/21
1st number: 3 0/4, 2nd number: 3 0/21
12/4 + 63/21 is 6/1.
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,
12/4 = 12 × 21/4 × 21 = 252/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
63/21 = 63 × 4/21 × 4 = 252/84 - Add the two like fractions:
252/84 + 252/84 = 252 + 252/84 = 504/84 - 504/84 simplified gives 6/1
- So, 12/4 + 63/21 = 6/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/4+63/21 12/8+63/21 12/4+63/42 36/4+63/21 60/4+63/21 12/20+63/21 84/4+63/21 12/28+63/21