Subtract 42/80 from 1/12
1/12 - 42/80 is -53/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 12 × 20 = 240,
1/12 = 1 × 20/12 × 20 = 20/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
42/80 = 42 × 3/80 × 3 = 126/240 - Subtract the two like fractions:
20/240 - 126/240 = 20 - 126/240 = -106/240 - After reducing the fraction, the answer is -53/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/12-42/80 1/12-84/80 1/24-42/80 3/12-42/80 1/36-42/80 5/12-42/80 1/60-42/80 7/12-42/80 1/84-42/80