Add 90/70 and 84/18
1st number: 1 20/70, 2nd number: 4 12/18
90/70 + 84/18 is 125/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
90/70 = 90 × 9/70 × 9 = 810/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
84/18 = 84 × 35/18 × 35 = 2940/630 - Add the two like fractions:
810/630 + 2940/630 = 810 + 2940/630 = 3750/630 - 3750/630 simplified gives 125/21
- So, 90/70 + 84/18 = 125/21
In mixed form: 520/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70+84/36 90/70+84/54 90/70+84/90