Subtract 42/56 from 3/7
3/7 - 42/56 is -9/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 56 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,
3/7 = 3 × 8/7 × 8 = 24/56 - Likewise, for the 2nd fraction, since 56 × 1 = 56,
42/56 = 42 × 1/56 × 1 = 42/56 - Subtract the two like fractions:
24/56 - 42/56 = 24 - 42/56 = -18/56 - After reducing the fraction, the answer is -9/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-42/56 3/7-84/56 3/14-42/56 9/7-42/56 3/21-42/56 15/7-42/56 3/35-42/56 21/7-42/56 3/49-42/56