Subtract 7/45 from 81/20
1st number: 4 1/20, 2nd number: 7/45
81/20 - 7/45 is 701/180.
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,
81/20 = 81 × 9/20 × 9 = 729/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
7/45 = 7 × 4/45 × 4 = 28/180 - Subtract the two like fractions:
729/180 - 28/180 = 729 - 28/180 = 701/180 - In mixed form: 3161/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20-14/45 81/40-7/45 81/20-7/90 81/20-21/45 81/60-7/45 81/20-35/45 81/20-49/45