Add 18/56 and 42/72
18/56 + 42/72 is 19/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 56 × 9 = 504,
18/56 = 18 × 9/56 × 9 = 162/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
42/72 = 42 × 7/72 × 7 = 294/504 - Add the two like fractions:
162/504 + 294/504 = 162 + 294/504 = 456/504 - 456/504 simplified gives 19/21
- So, 18/56 + 42/72 = 19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/56+42/72 18/56+84/72 54/56+42/72 90/56+42/72