Subtract 42/12 from 7/70
1st number: 7/70, 2nd number: 3 6/12
7/70 - 42/12 is -17/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 12 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 70 × 6 = 420,
7/70 = 7 × 6/70 × 6 = 42/420 - Likewise, for the 2nd fraction, since 12 × 35 = 420,
42/12 = 42 × 35/12 × 35 = 1470/420 - Subtract the two like fractions:
42/420 - 1470/420 = 42 - 1470/420 = -1428/420 - After reducing the fraction, the answer is -17/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/70-42/12 7/70-84/12 7/70-42/24 21/70-42/12 7/70-42/36 35/70-42/12 7/70-42/60 49/70-42/12 7/70-42/84