Add 12/15 and 42/54
12/15 + 42/54 is 71/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 15 × 18 = 270,
12/15 = 12 × 18/15 × 18 = 216/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
42/54 = 42 × 5/54 × 5 = 210/270 - Add the two like fractions:
216/270 + 210/270 = 216 + 210/270 = 426/270 - 426/270 simplified gives 71/45
- So, 12/15 + 42/54 = 71/45
In mixed form: 126/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15+42/54 12/15+84/54 12/30+42/54 36/15+42/54 12/45+42/54 60/15+42/54 12/75+42/54 84/15+42/54