Subtract 21/10 from 42/56
1st number: 42/56, 2nd number: 2 1/10
42/56 - 21/10 is -27/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 10 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
42/56 = 42 × 5/56 × 5 = 210/280 - Likewise, for the 2nd fraction, since 10 × 28 = 280,
21/10 = 21 × 28/10 × 28 = 588/280 - Subtract the two like fractions:
210/280 - 588/280 = 210 - 588/280 = -378/280 - After reducing the fraction, the answer is -27/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56-21/10 42/56-42/10 42/56-21/20 42/56-63/10 42/56-21/30 42/56-21/50 42/56-21/70