Subtract 21/8 from 42/14
1st number: 3 0/14, 2nd number: 2 5/8
42/14 - 21/8 is 3/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 14 × 4 = 56,
42/14 = 42 × 4/14 × 4 = 168/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
21/8 = 21 × 7/8 × 7 = 147/56 - Subtract the two like fractions:
168/56 - 147/56 = 168 - 147/56 = 21/56 - After reducing the fraction, the answer is 3/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/14-21/8 42/14-42/8 42/28-21/8 42/14-21/16 42/14-63/8 42/14-21/24 42/70-21/8 42/14-21/40 42/98-21/8 42/14-21/56