Subtract 27/90 from 30/40
30/40 - 27/90 is 9/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
30/40 = 30 × 9/40 × 9 = 270/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
27/90 = 27 × 4/90 × 4 = 108/360 - Subtract the two like fractions:
270/360 - 108/360 = 270 - 108/360 = 162/360 - After reducing the fraction, the answer is 9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/40-27/90 30/40-54/90 30/80-27/90 90/40-27/90 30/40-81/90