Subtract 3/12 from 42/70
42/70 - 3/12 is 7/20.
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,
42/70 = 42 × 6/70 × 6 = 252/420 - Likewise, for the 2nd fraction, since 12 × 35 = 420,
3/12 = 3 × 35/12 × 35 = 105/420 - Subtract the two like fractions:
252/420 - 105/420 = 252 - 105/420 = 147/420 - After reducing the fraction, the answer is 7/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70-3/12 42/70-6/12 42/70-3/24 42/70-9/12 42/70-3/36 42/70-15/12 42/70-3/60 42/70-21/12 42/70-3/84