Subtract 1/90 from 10/20
10/20 - 1/90 is 22/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
10/20 = 10 × 9/20 × 9 = 90/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
1/90 = 1 × 2/90 × 2 = 2/180 - Subtract the two like fractions:
90/180 - 2/180 = 90 - 2/180 = 88/180 - After reducing the fraction, the answer is 22/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-2/90 10/40-1/90 30/20-1/90 10/20-3/90 10/60-1/90 50/20-1/90 10/20-5/90 70/20-1/90 10/20-7/90