Subtract 21/18 from 14/20
1st number: 14/20, 2nd number: 1 3/18
14/20 - 21/18 is -7/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
14/20 = 14 × 9/20 × 9 = 126/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
21/18 = 21 × 10/18 × 10 = 210/180 - Subtract the two like fractions:
126/180 - 210/180 = 126 - 210/180 = -84/180 - After reducing the fraction, the answer is -7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/20-21/18 14/20-42/18 14/40-21/18 14/20-21/36 42/20-21/18 14/20-63/18 14/60-21/18 14/20-21/54 70/20-21/18 14/20-21/90 98/20-21/18