Add 21/24 and 90/63
1st number: 21/24, 2nd number: 1 27/63
21/24 + 90/63 is 129/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 63 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 24 × 21 = 504,
21/24 = 21 × 21/24 × 21 = 441/504 - Likewise, for the 2nd fraction, since 63 × 8 = 504,
90/63 = 90 × 8/63 × 8 = 720/504 - Add the two like fractions:
441/504 + 720/504 = 441 + 720/504 = 1161/504 - 1161/504 simplified gives 129/56
- So, 21/24 + 90/63 = 129/56
In mixed form: 217/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24+90/63 21/48+90/63 63/24+90/63 21/72+90/63