Add 4/42 and 21/72
4/42 + 21/72 is 65/168.
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,
21/72 = 21 × 7/72 × 7 = 147/504 - Add the two like fractions:
48/504 + 147/504 = 48 + 147/504 = 195/504 - 195/504 simplified gives 65/168
- So, 4/42 + 21/72 = 65/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42+21/72 4/42+42/72 4/84+21/72 12/42+21/72 4/42+63/72 20/42+21/72 28/42+21/72