Add 12/90 and 9/21
12/90 + 9/21 is 59/105.
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,
12/90 = 12 × 7/90 × 7 = 84/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
9/21 = 9 × 30/21 × 30 = 270/630 - Add the two like fractions:
84/630 + 270/630 = 84 + 270/630 = 354/630 - 354/630 simplified gives 59/105
- So, 12/90 + 9/21 = 59/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90+9/21 12/90+18/21 12/90+9/42 36/90+9/21 12/90+27/21 12/90+9/63 60/90+9/21 12/90+45/21 84/90+9/21 12/90+63/21