Add 63/21 and 18/15
1st number: 3 0/21, 2nd number: 1 3/15
63/21 + 18/15 is 21/5.
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,
18/15 = 18 × 7/15 × 7 = 126/105 - Add the two like fractions:
315/105 + 126/105 = 315 + 126/105 = 441/105 - 441/105 simplified gives 21/5
- So, 63/21 + 18/15 = 21/5
In mixed form: 41/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/21+36/15 63/42+18/15 63/21+18/30 63/21+54/15 63/21+18/45 63/21+90/15 63/21+18/75