Subtract 28/5 from 45/72
1st number: 45/72, 2nd number: 5 3/5
45/72 - 28/5 is -199/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 5 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
45/72 = 45 × 5/72 × 5 = 225/360 - Likewise, for the 2nd fraction, since 5 × 72 = 360,
28/5 = 28 × 72/5 × 72 = 2016/360 - Subtract the two like fractions:
225/360 - 2016/360 = 225 - 2016/360 = -1791/360 - After reducing the fraction, the answer is -199/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72-28/5 45/72-56/5 45/72-28/10 45/72-84/5 45/72-28/15 45/72-28/25 45/72-28/35