Subtract 21/10 from 42/12
1st number: 3 6/12, 2nd number: 2 1/10
42/12 - 21/10 is 7/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 10 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
42/12 = 42 × 5/12 × 5 = 210/60 - Likewise, for the 2nd fraction, since 10 × 6 = 60,
21/10 = 21 × 6/10 × 6 = 126/60 - Subtract the two like fractions:
210/60 - 126/60 = 210 - 126/60 = 84/60 - After reducing the fraction, the answer is 7/5
- In mixed form: 12/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-21/10 42/12-42/10 42/24-21/10 42/12-21/20 42/12-63/10 42/36-21/10 42/12-21/30 42/60-21/10 42/12-21/50 42/84-21/10 42/12-21/70