Add 63/15 and 12/21
1st number: 4 3/15, 2nd number: 12/21
63/15 + 12/21 is 167/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
63/15 = 63 × 7/15 × 7 = 441/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
12/21 = 12 × 5/21 × 5 = 60/105 - Add the two like fractions:
441/105 + 60/105 = 441 + 60/105 = 501/105 - 501/105 simplified gives 167/35
- So, 63/15 + 12/21 = 167/35
In mixed form: 427/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/15+24/21 63/30+12/21 63/15+12/42 63/15+36/21 63/45+12/21 63/15+12/63 63/15+60/21 63/75+12/21 63/15+84/21