Subtract 42/12 from 7/80
1st number: 7/80, 2nd number: 3 6/12
7/80 - 42/12 is -273/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 12 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
7/80 = 7 × 3/80 × 3 = 21/240 - Likewise, for the 2nd fraction, since 12 × 20 = 240,
42/12 = 42 × 20/12 × 20 = 840/240 - Subtract the two like fractions:
21/240 - 840/240 = 21 - 840/240 = -819/240 - After reducing the fraction, the answer is -273/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/80-42/12 7/80-84/12 7/80-42/24 21/80-42/12 7/80-42/36 35/80-42/12 7/80-42/60 49/80-42/12 7/80-42/84