Subtract 1/45 from 9/20
9/20 - 1/45 is 77/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 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 45 × 4 = 180,
1/45 = 1 × 4/45 × 4 = 4/180 - Subtract the two like fractions:
81/180 - 4/180 = 81 - 4/180 = 77/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-1/45 9/20-2/45 9/40-1/45 9/20-1/90 27/20-1/45 9/20-3/45 9/60-1/45 45/20-1/45 9/20-5/45 63/20-1/45 9/20-7/45