Subtract 21/70 from 1/12
1/12 - 21/70 is -13/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 70 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 12 × 35 = 420,
1/12 = 1 × 35/12 × 35 = 35/420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,
21/70 = 21 × 6/70 × 6 = 126/420 - Subtract the two like fractions:
35/420 - 126/420 = 35 - 126/420 = -91/420 - After reducing the fraction, the answer is -13/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/12-21/70 1/12-42/70 1/24-21/70 3/12-21/70 1/12-63/70 1/36-21/70 5/12-21/70 1/60-21/70 7/12-21/70 1/84-21/70