Subtract 21/7 from 18/70
1st number: 18/70, 2nd number: 3 0/7
18/70 - 21/7 is -96/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 7 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
18/70 = 18 × 1/70 × 1 = 18/70 - Likewise, for the 2nd fraction, since 7 × 10 = 70,
21/7 = 21 × 10/7 × 10 = 210/70 - Subtract the two like fractions:
18/70 - 210/70 = 18 - 210/70 = -192/70 - After reducing the fraction, the answer is -96/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/70-21/7 18/70-42/7 18/70-21/14 54/70-21/7 18/70-63/7 90/70-21/7 18/70-21/35 18/70-21/49