Add 21/70 and 56/9
1st number: 21/70, 2nd number: 6 2/9
21/70 + 56/9 is 587/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 9 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
21/70 = 21 × 9/70 × 9 = 189/630 - Likewise, for the 2nd fraction, since 9 × 70 = 630,
56/9 = 56 × 70/9 × 70 = 3920/630 - Add the two like fractions:
189/630 + 3920/630 = 189 + 3920/630 = 4109/630 - 4109/630 simplified gives 587/90
- So, 21/70 + 56/9 = 587/90
In mixed form: 647/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+56/9 21/70+56/18 63/70+56/9 21/70+56/27 21/70+56/45 21/70+56/63