Subtract 9/28 from 9/20
9/20 - 9/28 is 9/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
9/20 = 9 × 7/20 × 7 = 63/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
9/28 = 9 × 5/28 × 5 = 45/140 - Subtract the two like fractions:
63/140 - 45/140 = 63 - 45/140 = 18/140 - After reducing the fraction, the answer is 9/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-9/28 9/20-18/28 9/40-9/28 9/20-9/56 27/20-9/28 9/20-27/28 9/60-9/28 9/20-9/84 45/20-9/28 9/20-45/28 63/20-9/28 9/20-63/28