Subtract 7/45 from 75/20
1st number: 3 15/20, 2nd number: 7/45
75/20 - 7/45 is 647/180.
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,
75/20 = 75 × 9/20 × 9 = 675/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
7/45 = 7 × 4/45 × 4 = 28/180 - Subtract the two like fractions:
675/180 - 28/180 = 675 - 28/180 = 647/180 - In mixed form: 3107/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/20-14/45 75/40-7/45 75/20-7/90 75/20-21/45 75/60-7/45 75/20-35/45 75/20-49/45