Add 63/21 and 12/15
1st number: 3 0/21, 2nd number: 12/15
63/21 + 12/15 is 19/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
63/21 = 63 × 5/21 × 5 = 315/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
12/15 = 12 × 7/15 × 7 = 84/105 - Add the two like fractions:
315/105 + 84/105 = 315 + 84/105 = 399/105 - 399/105 simplified gives 19/5
- So, 63/21 + 12/15 = 19/5
In mixed form: 34/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/21+24/15 63/42+12/15 63/21+12/30 63/21+36/15 63/21+12/45 63/21+60/15 63/21+12/75 63/21+84/15