Add 72/9 and 90/70
1st number: 8 0/9, 2nd number: 1 20/70
72/9 + 90/70 is 65/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 9 × 70 = 630,
72/9 = 72 × 70/9 × 70 = 5040/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
90/70 = 90 × 9/70 × 9 = 810/630 - Add the two like fractions:
5040/630 + 810/630 = 5040 + 810/630 = 5850/630 - 5850/630 simplified gives 65/7
- So, 72/9 + 90/70 = 65/7
In mixed form: 92/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18+90/70 72/27+90/70 72/45+90/70 72/63+90/70