Add 21/18 and 18/70
1st number: 1 3/18, 2nd number: 18/70
21/18 + 18/70 is 299/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
21/18 = 21 × 35/18 × 35 = 735/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
18/70 = 18 × 9/70 × 9 = 162/630 - Add the two like fractions:
735/630 + 162/630 = 735 + 162/630 = 897/630 - 897/630 simplified gives 299/210
- So, 21/18 + 18/70 = 299/210
In mixed form: 189/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+18/70 21/18+36/70 21/36+18/70 63/18+18/70 21/18+54/70 21/54+18/70 21/18+90/70 21/90+18/70