Add 90/15 and 54/42
1st number: 6 0/15, 2nd number: 1 12/42
90/15 + 54/42 is 51/7.
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,
90/15 = 90 × 14/15 × 14 = 1260/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
54/42 = 54 × 5/42 × 5 = 270/210 - Add the two like fractions:
1260/210 + 270/210 = 1260 + 270/210 = 1530/210 - 1530/210 simplified gives 51/7
- So, 90/15 + 54/42 = 51/7
In mixed form: 72/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+54/42 90/15+54/84 90/45+54/42 90/75+54/42