Add 7/70 and 18/21
7/70 + 18/21 is 67/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
7/70 = 7 × 3/70 × 3 = 21/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
18/21 = 18 × 10/21 × 10 = 180/210 - Add the two like fractions:
21/210 + 180/210 = 21 + 180/210 = 201/210 - 201/210 simplified gives 67/70
- So, 7/70 + 18/21 = 67/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/70+18/21 7/70+36/21 7/70+18/42 21/70+18/21 7/70+54/21 7/70+18/63 35/70+18/21 7/70+90/21 49/70+18/21