Subtract 20/70 from 12/28
12/28 - 20/70 is 1/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
12/28 = 12 × 5/28 × 5 = 60/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
20/70 = 20 × 2/70 × 2 = 40/140 - Subtract the two like fractions:
60/140 - 40/140 = 60 - 40/140 = 20/140 - After reducing the fraction, the answer is 1/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28-20/70 12/28-40/70 12/56-20/70 36/28-20/70 12/28-60/70 12/84-20/70 60/28-20/70 84/28-20/70