Subtract 90/30 from 42/24
1st number: 1 18/24, 2nd number: 3 0/30
42/24 - 90/30 is -5/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
42/24 = 42 × 5/24 × 5 = 210/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
90/30 = 90 × 4/30 × 4 = 360/120 - Subtract the two like fractions:
210/120 - 360/120 = 210 - 360/120 = -150/120 - After reducing the fraction, the answer is -5/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/24-90/30 42/48-90/30 42/24-90/60 42/72-90/30