Subtract 75/40 from 20/90
1st number: 20/90, 2nd number: 1 35/40
20/90 - 75/40 is -119/72.
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,
20/90 = 20 × 4/90 × 4 = 80/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
75/40 = 75 × 9/40 × 9 = 675/360 - Subtract the two like fractions:
80/360 - 675/360 = 80 - 675/360 = -595/360 - After reducing the fraction, the answer is -119/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90-75/40 20/90-75/80 60/90-75/40