Add 21/9 and 90/70
1st number: 2 3/9, 2nd number: 1 20/70
21/9 + 90/70 is 76/21.
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,
21/9 = 21 × 70/9 × 70 = 1470/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
90/70 = 90 × 9/70 × 9 = 810/630 - Add the two like fractions:
1470/630 + 810/630 = 1470 + 810/630 = 2280/630 - 2280/630 simplified gives 76/21
- So, 21/9 + 90/70 = 76/21
In mixed form: 313/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+90/70 21/18+90/70 63/9+90/70 21/27+90/70 21/45+90/70 21/63+90/70