Subtract 24/40 from 27/90
27/90 - 24/40 is -3/10.
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,
27/90 = 27 × 4/90 × 4 = 108/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
24/40 = 24 × 9/40 × 9 = 216/360 - Subtract the two like fractions:
108/360 - 216/360 = 108 - 216/360 = -108/360 - After reducing the fraction, the answer is -3/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/90-24/40 27/90-48/40 27/90-24/80 81/90-24/40 27/90-72/40