Add 3/42 and 18/72
3/42 + 18/72 is 9/28.
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,
3/42 = 3 × 12/42 × 12 = 36/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
18/72 = 18 × 7/72 × 7 = 126/504 - Add the two like fractions:
36/504 + 126/504 = 36 + 126/504 = 162/504 - 162/504 simplified gives 9/28
- So, 3/42 + 18/72 = 9/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42+18/72 3/42+36/72 3/84+18/72 9/42+18/72 3/42+54/72 15/42+18/72 3/42+90/72 21/42+18/72