Add 4/21 and 18/72
4/21 + 18/72 is 37/84.
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,
4/21 = 4 × 24/21 × 24 = 96/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
18/72 = 18 × 7/72 × 7 = 126/504 - Add the two like fractions:
96/504 + 126/504 = 96 + 126/504 = 222/504 - 222/504 simplified gives 37/84
- So, 4/21 + 18/72 = 37/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+18/72 4/21+36/72 4/42+18/72 12/21+18/72 4/21+54/72 4/63+18/72 20/21+18/72 4/21+90/72 28/21+18/72