Add 7/21 and 24/90
7/21 + 24/90 is 3/5.
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,
7/21 = 7 × 30/21 × 30 = 210/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
24/90 = 24 × 7/90 × 7 = 168/630 - Add the two like fractions:
210/630 + 168/630 = 210 + 168/630 = 378/630 - 378/630 simplified gives 3/5
- So, 7/21 + 24/90 = 3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+24/90 7/21+48/90 7/42+24/90 7/21+72/90 7/63+24/90 35/21+24/90 49/21+24/90