Add 90/21 and 7/90
1st number: 4 6/21, 2nd number: 7/90
90/21 + 7/90 is 2749/630.
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,
90/21 = 90 × 30/21 × 30 = 2700/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
7/90 = 7 × 7/90 × 7 = 49/630 - Add the two like fractions:
2700/630 + 49/630 = 2700 + 49/630 = 2749/630 - So, 90/21 + 7/90 = 2749/630
In mixed form: 4229/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+14/90 90/42+7/90 90/21+21/90 90/63+7/90 90/21+35/90 90/21+49/90