Subtract 90/70 from 6/7
1st number: 6/7, 2nd number: 1 20/70
6/7 - 90/70 is -3/7.
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,
6/7 = 6 × 10/7 × 10 = 60/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
90/70 = 90 × 1/70 × 1 = 90/70 - Subtract the two like fractions:
60/70 - 90/70 = 60 - 90/70 = -30/70 - After reducing the fraction, the answer is -3/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/7-90/70 6/14-90/70 18/7-90/70 6/21-90/70 30/7-90/70 6/35-90/70 42/7-90/70 6/49-90/70