Subtract 28/40 from 10/90
10/90 - 28/40 is -53/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
10/90 = 10 × 4/90 × 4 = 40/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
28/40 = 28 × 9/40 × 9 = 252/360 - Subtract the two like fractions:
40/360 - 252/360 = 40 - 252/360 = -212/360 - After reducing the fraction, the answer is -53/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/90-28/40 10/90-56/40 10/90-28/80 30/90-28/40 10/90-84/40 50/90-28/40 70/90-28/40