Add 4/42 and 20/72
4/42 + 20/72 is 47/126.
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,
4/42 = 4 × 12/42 × 12 = 48/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
20/72 = 20 × 7/72 × 7 = 140/504 - Add the two like fractions:
48/504 + 140/504 = 48 + 140/504 = 188/504 - 188/504 simplified gives 47/126
- So, 4/42 + 20/72 = 47/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42+20/72 4/42+40/72 4/84+20/72 12/42+20/72 4/42+60/72 20/42+20/72 28/42+20/72