Subtract 20/12 from 72/70
1st number: 1 2/70, 2nd number: 1 8/12
72/70 - 20/12 is -67/105.
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,
72/70 = 72 × 6/70 × 6 = 432/420 - Likewise, for the 2nd fraction, since 12 × 35 = 420,
20/12 = 20 × 35/12 × 35 = 700/420 - Subtract the two like fractions:
432/420 - 700/420 = 432 - 700/420 = -268/420 - After reducing the fraction, the answer is -67/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70-40/12 72/70-20/24 72/70-60/12 72/70-20/36 72/70-20/60 72/70-20/84