Subtract 90/10 from 20/70
1st number: 20/70, 2nd number: 9 0/10
20/70 - 90/10 is -61/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
20/70 = 20 × 1/70 × 1 = 20/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
90/10 = 90 × 7/10 × 7 = 630/70 - Subtract the two like fractions:
20/70 - 630/70 = 20 - 630/70 = -610/70 - After reducing the fraction, the answer is -61/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70-90/10 20/70-90/20 60/70-90/10 20/70-90/30 20/70-90/50 20/70-90/70