Subtract 12/84 from 20/28
20/28 - 12/84 is 4/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
20/28 = 20 × 3/28 × 3 = 60/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
12/84 = 12 × 1/84 × 1 = 12/84 - Subtract the two like fractions:
60/84 - 12/84 = 60 - 12/84 = 48/84 - After reducing the fraction, the answer is 4/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28-12/84 20/28-24/84 20/56-12/84 60/28-12/84 20/28-36/84 20/84-12/84 20/28-60/84