Add 6/21 and 12/90
6/21 + 12/90 is 44/105.
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,
6/21 = 6 × 30/21 × 30 = 180/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
12/90 = 12 × 7/90 × 7 = 84/630 - Add the two like fractions:
180/630 + 84/630 = 180 + 84/630 = 264/630 - 264/630 simplified gives 44/105
- So, 6/21 + 12/90 = 44/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21+12/90 6/21+24/90 6/42+12/90 18/21+12/90 6/21+36/90 6/63+12/90 30/21+12/90 6/21+60/90 42/21+12/90 6/21+84/90