Add 30/42 and 90/72
1st number: 30/42, 2nd number: 1 18/72
30/42 + 90/72 is 55/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 42 × 12 = 504,
30/42 = 30 × 12/42 × 12 = 360/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
90/72 = 90 × 7/72 × 7 = 630/504 - Add the two like fractions:
360/504 + 630/504 = 360 + 630/504 = 990/504 - 990/504 simplified gives 55/28
- So, 30/42 + 90/72 = 55/28
In mixed form: 127/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42+90/72 30/84+90/72 90/42+90/72