Add 2/21 and 3/90
2/21 + 3/90 is 9/70.
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,
2/21 = 2 × 30/21 × 30 = 60/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
3/90 = 3 × 7/90 × 7 = 21/630 - Add the two like fractions:
60/630 + 21/630 = 60 + 21/630 = 81/630 - 81/630 simplified gives 9/70
- So, 2/21 + 3/90 = 9/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21+3/90 2/21+6/90 2/42+3/90 6/21+3/90 2/21+9/90 2/63+3/90 10/21+3/90 2/21+15/90 14/21+3/90 2/21+21/90