Subtract 42/10 from 27/9
1st number: 3 0/9, 2nd number: 4 2/10
27/9 - 42/10 is -6/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
27/9 = 27 × 10/9 × 10 = 270/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
42/10 = 42 × 9/10 × 9 = 378/90 - Subtract the two like fractions:
270/90 - 378/90 = 270 - 378/90 = -108/90 - After reducing the fraction, the answer is -6/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/9-42/10 27/9-84/10 27/18-42/10 27/9-42/20 81/9-42/10 27/9-42/30 27/45-42/10 27/9-42/50 27/63-42/10 27/9-42/70