Subtract 27/20 from 7/45
1st number: 7/45, 2nd number: 1 7/20
7/45 - 27/20 is -43/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
7/45 = 7 × 4/45 × 4 = 28/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
27/20 = 27 × 9/20 × 9 = 243/180 - Subtract the two like fractions:
28/180 - 243/180 = 28 - 243/180 = -215/180 - After reducing the fraction, the answer is -43/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/45-27/20 7/45-54/20 7/90-27/20 7/45-27/40 21/45-27/20 7/45-81/20 7/45-27/60 35/45-27/20 49/45-27/20