Subtract 3/90 from 9/20
9/20 - 3/90 is 5/12.
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,
9/20 = 9 × 9/20 × 9 = 81/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
3/90 = 3 × 2/90 × 2 = 6/180 - Subtract the two like fractions:
81/180 - 6/180 = 81 - 6/180 = 75/180 - After reducing the fraction, the answer is 5/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-3/90 9/20-6/90 9/40-3/90 27/20-3/90 9/20-9/90 9/60-3/90 45/20-3/90 9/20-15/90 63/20-3/90 9/20-21/90