Subtract 7/80 from 42/12
1st number: 3 6/12, 2nd number: 7/80
42/12 - 7/80 is 273/80.
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,
42/12 = 42 × 20/12 × 20 = 840/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
7/80 = 7 × 3/80 × 3 = 21/240 - Subtract the two like fractions:
840/240 - 21/240 = 840 - 21/240 = 819/240 - After reducing the fraction, the answer is 273/80
- In mixed form: 333/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-7/80 42/12-14/80 42/24-7/80 42/12-21/80 42/36-7/80 42/12-35/80 42/60-7/80 42/12-49/80 42/84-7/80