Subtract 3/20 from 3/90
3/90 - 3/20 is -7/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
3/90 = 3 × 2/90 × 2 = 6/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
3/20 = 3 × 9/20 × 9 = 27/180 - Subtract the two like fractions:
6/180 - 27/180 = 6 - 27/180 = -21/180 - After reducing the fraction, the answer is -7/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/90-3/20 3/90-6/20 3/90-3/40 9/90-3/20 3/90-9/20 3/90-3/60 15/90-3/20 3/90-15/20 21/90-3/20 3/90-21/20