Subtract 27/10 from 20/45
1st number: 20/45, 2nd number: 2 7/10
20/45 - 27/10 is -203/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
20/45 = 20 × 2/45 × 2 = 40/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
27/10 = 27 × 9/10 × 9 = 243/90 - Subtract the two like fractions:
40/90 - 243/90 = 40 - 243/90 = -203/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-27/10 20/45-54/10 20/90-27/10 20/45-27/20 60/45-27/10 20/45-81/10 20/45-27/30 20/45-27/50 20/45-27/70