Subtract 3/40 from 20/12
1st number: 1 8/12, 2nd number: 3/40
20/12 - 3/40 is 191/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 12 × 10 = 120,
20/12 = 20 × 10/12 × 10 = 200/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
3/40 = 3 × 3/40 × 3 = 9/120 - Subtract the two like fractions:
200/120 - 9/120 = 200 - 9/120 = 191/120 - In mixed form: 171/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12-3/40 20/12-6/40 20/24-3/40 20/12-3/80 60/12-3/40 20/12-9/40 20/36-3/40 20/12-15/40 20/60-3/40 20/12-21/40 20/84-3/40