Add 3/21 and 4/72
3/21 + 4/72 is 25/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
3/21 = 3 × 24/21 × 24 = 72/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
4/72 = 4 × 7/72 × 7 = 28/504 - Add the two like fractions:
72/504 + 28/504 = 72 + 28/504 = 100/504 - 100/504 simplified gives 25/126
- So, 3/21 + 4/72 = 25/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+4/72 3/21+8/72 3/42+4/72 9/21+4/72 3/21+12/72 3/63+4/72 15/21+4/72 3/21+20/72 3/21+28/72