Subtract 80/9 from 28/40
1st number: 28/40, 2nd number: 8 8/9
28/40 - 80/9 is -737/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
28/40 = 28 × 9/40 × 9 = 252/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
80/9 = 80 × 40/9 × 40 = 3200/360 - Subtract the two like fractions:
252/360 - 3200/360 = 252 - 3200/360 = -2948/360 - After reducing the fraction, the answer is -737/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40-80/9 28/80-80/9 28/40-80/18 84/40-80/9 28/40-80/27 28/40-80/45 28/40-80/63