Add 72/54 and 15/42
1st number: 1 18/54, 2nd number: 15/42
72/54 + 15/42 is 71/42.
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,
72/54 = 72 × 7/54 × 7 = 504/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
15/42 = 15 × 9/42 × 9 = 135/378 - Add the two like fractions:
504/378 + 135/378 = 504 + 135/378 = 639/378 - 639/378 simplified gives 71/42
- So, 72/54 + 15/42 = 71/42
In mixed form: 129/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/54+30/42 72/54+15/84 72/54+45/42 72/54+75/42