Add 9/21 and 2/90
9/21 + 2/90 is 142/315.
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,
9/21 = 9 × 30/21 × 30 = 270/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
2/90 = 2 × 7/90 × 7 = 14/630 - Add the two like fractions:
270/630 + 14/630 = 270 + 14/630 = 284/630 - 284/630 simplified gives 142/315
- So, 9/21 + 2/90 = 142/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21+2/90 9/21+4/90 9/42+2/90 27/21+2/90 9/21+6/90 9/63+2/90 45/21+2/90 9/21+10/90 63/21+2/90 9/21+14/90