Add 21/72 and 4/63
21/72 + 4/63 is 179/504.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 63 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Likewise, for the 2nd fraction, since 63 × 8 = 504,
4/63 = 4 × 8/63 × 8 = 32/504 - Add the two like fractions:
147/504 + 32/504 = 147 + 32/504 = 179/504 - So, 21/72 + 4/63 = 179/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+4/63 21/72+8/63 63/72+4/63 21/72+12/63 21/72+20/63 21/72+28/63