Subtract 30/70 from 18/7
1st number: 2 4/7, 2nd number: 30/70
18/7 - 30/70 is 15/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 7 × 10 = 70,
18/7 = 18 × 10/7 × 10 = 180/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
30/70 = 30 × 1/70 × 1 = 30/70 - Subtract the two like fractions:
180/70 - 30/70 = 180 - 30/70 = 150/70 - After reducing the fraction, the answer is 15/7
- In mixed form: 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/7-30/70 18/7-60/70 18/14-30/70 54/7-30/70 18/7-90/70 18/21-30/70 90/7-30/70 18/35-30/70 18/49-30/70