Subtract 9/21 from 49/42
1st number: 1 7/42, 2nd number: 9/21
49/42 - 9/21 is 31/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
49/42 = 49 × 1/42 × 1 = 49/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
9/21 = 9 × 2/21 × 2 = 18/42 - Subtract the two like fractions:
49/42 - 18/42 = 49 - 18/42 = 31/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/42-9/21 49/42-18/21 49/84-9/21 49/42-9/42 49/42-27/21 49/42-9/63 49/42-45/21 49/42-63/21