Add 8/21 and 3/72
8/21 + 3/72 is 71/168.
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,
8/21 = 8 × 24/21 × 24 = 192/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
3/72 = 3 × 7/72 × 7 = 21/504 - Add the two like fractions:
192/504 + 21/504 = 192 + 21/504 = 213/504 - 213/504 simplified gives 71/168
- So, 8/21 + 3/72 = 71/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+3/72 8/21+6/72 8/42+3/72 24/21+3/72 8/21+9/72 8/63+3/72 40/21+3/72 8/21+15/72 56/21+3/72 8/21+21/72