Subtract 80/45 from 28/40
1st number: 28/40, 2nd number: 1 35/45
28/40 - 80/45 is -97/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 45 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 45 × 8 = 360,
80/45 = 80 × 8/45 × 8 = 640/360 - Subtract the two like fractions:
252/360 - 640/360 = 252 - 640/360 = -388/360 - After reducing the fraction, the answer is -97/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40-80/45 28/80-80/45 28/40-80/90 84/40-80/45