Add 49/21 and 15/90
1st number: 2 7/21, 2nd number: 15/90
49/21 + 15/90 is 5/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
49/21 = 49 × 30/21 × 30 = 1470/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
15/90 = 15 × 7/90 × 7 = 105/630 - Add the two like fractions:
1470/630 + 105/630 = 1470 + 105/630 = 1575/630 - 1575/630 simplified gives 5/2
- So, 49/21 + 15/90 = 5/2
In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/21+15/90 49/21+30/90 49/42+15/90 49/21+45/90 49/63+15/90 49/21+75/90