Subtract 7/20 from 72/45
1st number: 1 27/45, 2nd number: 7/20
72/45 - 7/20 is 5/4.
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,
72/45 = 72 × 4/45 × 4 = 288/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
7/20 = 7 × 9/20 × 9 = 63/180 - Subtract the two like fractions:
288/180 - 63/180 = 288 - 63/180 = 225/180 - After reducing the fraction, the answer is 5/4
- In mixed form: 11/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/45-14/20 72/90-7/20 72/45-7/40 72/45-21/20 72/45-7/60 72/45-35/20 72/45-49/20