Add 40/21 and 27/90
1st number: 1 19/21, 2nd number: 27/90
40/21 + 27/90 is 463/210.
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,
40/21 = 40 × 30/21 × 30 = 1200/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
27/90 = 27 × 7/90 × 7 = 189/630 - Add the two like fractions:
1200/630 + 189/630 = 1200 + 189/630 = 1389/630 - 1389/630 simplified gives 463/210
- So, 40/21 + 27/90 = 463/210
In mixed form: 243/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+27/90 40/21+54/90 40/42+27/90 40/21+81/90 40/63+27/90