Subtract 12/7 from 42/70
1st number: 42/70, 2nd number: 1 5/7
42/70 - 12/7 is -39/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 7 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
42/70 = 42 × 1/70 × 1 = 42/70 - Likewise, for the 2nd fraction, since 7 × 10 = 70,
12/7 = 12 × 10/7 × 10 = 120/70 - Subtract the two like fractions:
42/70 - 120/70 = 42 - 120/70 = -78/70 - After reducing the fraction, the answer is -39/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70-12/7 42/70-24/7 42/70-12/14 42/70-36/7 42/70-12/21 42/70-60/7 42/70-12/35 42/70-84/7 42/70-12/49