Subtract 7/90 from 2/20
2/20 - 7/90 is 1/45.
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,
2/20 = 2 × 9/20 × 9 = 18/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
7/90 = 7 × 2/90 × 2 = 14/180 - Subtract the two like fractions:
18/180 - 14/180 = 18 - 14/180 = 4/180 - After reducing the fraction, the answer is 1/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/20-7/90 2/20-14/90 2/40-7/90 6/20-7/90 2/20-21/90 2/60-7/90 10/20-7/90 2/20-35/90 14/20-7/90 2/20-49/90