Add 9/90 and 5/21
9/90 + 5/21 is 71/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
9/90 = 9 × 7/90 × 7 = 63/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
5/21 = 5 × 30/21 × 30 = 150/630 - Add the two like fractions:
63/630 + 150/630 = 63 + 150/630 = 213/630 - 213/630 simplified gives 71/210
- So, 9/90 + 5/21 = 71/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/90+5/21 9/90+10/21 9/90+5/42 27/90+5/21 9/90+15/21 9/90+5/63 45/90+5/21 9/90+25/21 63/90+5/21 9/90+35/21