Add 12/72 and 4/21
12/72 + 4/21 is 5/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
12/72 = 12 × 7/72 × 7 = 84/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
4/21 = 4 × 24/21 × 24 = 96/504 - Add the two like fractions:
84/504 + 96/504 = 84 + 96/504 = 180/504 - 180/504 simplified gives 5/14
- So, 12/72 + 4/21 = 5/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/72+4/21 12/72+8/21 12/72+4/42 36/72+4/21 12/72+12/21 12/72+4/63 60/72+4/21 12/72+20/21 84/72+4/21 12/72+28/21