Subtract 42/24 from 20/90
1st number: 20/90, 2nd number: 1 18/24
20/90 - 42/24 is -55/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 24 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 24 × 15 = 360,
42/24 = 42 × 15/24 × 15 = 630/360 - Subtract the two like fractions:
80/360 - 630/360 = 80 - 630/360 = -550/360 - After reducing the fraction, the answer is -55/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90-42/24 20/90-84/24 20/90-42/48 60/90-42/24 20/90-42/72