Add 49/90 and 72/21
1st number: 49/90, 2nd number: 3 9/21
49/90 + 72/21 is 2503/630.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
49/90 = 49 × 7/90 × 7 = 343/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
72/21 = 72 × 30/21 × 30 = 2160/630 - Add the two like fractions:
343/630 + 2160/630 = 343 + 2160/630 = 2503/630 - So, 49/90 + 72/21 = 2503/630
In mixed form: 3613/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/90+72/21 49/90+72/42 49/90+72/63