Add 12/15 and 63/42
1st number: 12/15, 2nd number: 1 21/42
12/15 + 63/42 is 23/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
12/15 = 12 × 14/15 × 14 = 168/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
63/42 = 63 × 5/42 × 5 = 315/210 - Add the two like fractions:
168/210 + 315/210 = 168 + 315/210 = 483/210 - 483/210 simplified gives 23/10
- So, 12/15 + 63/42 = 23/10
In mixed form: 23/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15+63/42 12/30+63/42 12/15+63/84 36/15+63/42 12/45+63/42 60/15+63/42 12/75+63/42 84/15+63/42