Add 28/70 and 21/18
1st number: 28/70, 2nd number: 1 3/18
28/70 + 21/18 is 47/30.
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,
28/70 = 28 × 9/70 × 9 = 252/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
21/18 = 21 × 35/18 × 35 = 735/630 - Add the two like fractions:
252/630 + 735/630 = 252 + 735/630 = 987/630 - 987/630 simplified gives 47/30
- So, 28/70 + 21/18 = 47/30
In mixed form: 117/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/70+21/18 28/70+42/18 28/70+21/36 84/70+21/18 28/70+63/18 28/70+21/54 28/70+21/90