Add 30/42 and 18/72
30/42 + 18/72 is 27/28.
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,
18/72 = 18 × 7/72 × 7 = 126/504 - Add the two like fractions:
360/504 + 126/504 = 360 + 126/504 = 486/504 - 486/504 simplified gives 27/28
- So, 30/42 + 18/72 = 27/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42+18/72 30/42+36/72 30/84+18/72 90/42+18/72 30/42+54/72 30/42+90/72