Add 90/18 and 81/70
1st number: 5 0/18, 2nd number: 1 11/70
90/18 + 81/70 is 431/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
90/18 = 90 × 35/18 × 35 = 3150/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630 - Add the two like fractions:
3150/630 + 729/630 = 3150 + 729/630 = 3879/630 - 3879/630 simplified gives 431/70
- So, 90/18 + 81/70 = 431/70
In mixed form: 611/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/36+81/70 90/54+81/70