Subtract 42/40 from 30/18
1st number: 1 12/18, 2nd number: 1 2/40
30/18 - 42/40 is 37/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
30/18 = 30 × 20/18 × 20 = 600/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
42/40 = 42 × 9/40 × 9 = 378/360 - Subtract the two like fractions:
600/360 - 378/360 = 600 - 378/360 = 222/360 - After reducing the fraction, the answer is 37/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18-42/40 30/18-84/40 30/36-42/40 30/18-42/80 90/18-42/40 30/54-42/40 30/90-42/40