Subtract 16/42 from 20/28
20/28 - 16/42 is 1/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 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 42 × 2 = 84,
16/42 = 16 × 2/42 × 2 = 32/84 - Subtract the two like fractions:
60/84 - 32/84 = 60 - 32/84 = 28/84 - After reducing the fraction, the answer is 1/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28-16/42 20/28-32/42 20/56-16/42 20/28-16/84 60/28-16/42 20/28-48/42 20/84-16/42 20/28-80/42