Add 72/42 and 42/90
1st number: 1 30/42, 2nd number: 42/90
72/42 + 42/90 is 229/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
72/42 = 72 × 15/42 × 15 = 1080/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Add the two like fractions:
1080/630 + 294/630 = 1080 + 294/630 = 1374/630 - 1374/630 simplified gives 229/105
- So, 72/42 + 42/90 = 229/105
In mixed form: 219/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42+84/90 72/84+42/90