Subtract 50/20 from 42/45
1st number: 42/45, 2nd number: 2 10/20
42/45 - 50/20 is -47/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
42/45 = 42 × 4/45 × 4 = 168/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
50/20 = 50 × 9/20 × 9 = 450/180 - Subtract the two like fractions:
168/180 - 450/180 = 168 - 450/180 = -282/180 - After reducing the fraction, the answer is -47/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-50/20 42/90-50/20 42/45-50/40 42/45-50/60