Subtract 21/75 from 42/12
1st number: 3 6/12, 2nd number: 21/75
42/12 - 21/75 is 161/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 75 is 300
Next, find the equivalent fraction of both fractional numbers with denominator 300 - For the 1st fraction, since 12 × 25 = 300,
42/12 = 42 × 25/12 × 25 = 1050/300 - Likewise, for the 2nd fraction, since 75 × 4 = 300,
21/75 = 21 × 4/75 × 4 = 84/300 - Subtract the two like fractions:
1050/300 - 84/300 = 1050 - 84/300 = 966/300 - After reducing the fraction, the answer is 161/50
- In mixed form: 311/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-21/75 42/12-42/75 42/24-21/75 42/12-63/75 42/36-21/75 42/60-21/75 42/84-21/75