Subtract 90/9 from 30/20
1st number: 1 10/20, 2nd number: 10 0/9
30/20 - 90/9 is -17/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
30/20 = 30 × 9/20 × 9 = 270/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
90/9 = 90 × 20/9 × 20 = 1800/180 - Subtract the two like fractions:
270/180 - 1800/180 = 270 - 1800/180 = -1530/180 - After reducing the fraction, the answer is -17/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20-90/9 30/40-90/9 30/20-90/18 90/20-90/9 30/60-90/9 30/20-90/27 30/20-90/45 30/20-90/63