Add 45/21 and 9/90
1st number: 2 3/21, 2nd number: 9/90
45/21 + 9/90 is 157/70.
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,
45/21 = 45 × 30/21 × 30 = 1350/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
9/90 = 9 × 7/90 × 7 = 63/630 - Add the two like fractions:
1350/630 + 63/630 = 1350 + 63/630 = 1413/630 - 1413/630 simplified gives 157/70
- So, 45/21 + 9/90 = 157/70
In mixed form: 217/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+9/90 45/21+18/90 45/42+9/90 45/21+27/90 45/63+9/90 45/21+45/90 45/21+63/90