Add 15/54 and 63/42
1st number: 15/54, 2nd number: 1 21/42
15/54 + 63/42 is 16/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
15/54 = 15 × 7/54 × 7 = 105/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
63/42 = 63 × 9/42 × 9 = 567/378 - Add the two like fractions:
105/378 + 567/378 = 105 + 567/378 = 672/378 - 672/378 simplified gives 16/9
- So, 15/54 + 63/42 = 16/9
In mixed form: 17/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/54+63/42 15/54+63/84 45/54+63/42 75/54+63/42