Subtract 4/16 from 21/18
1st number: 1 3/18, 2nd number: 4/16
21/18 - 4/16 is 11/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 16 is 144
Next, find the equivalent fraction of both fractional numbers with denominator 144 - For the 1st fraction, since 18 × 8 = 144,
21/18 = 21 × 8/18 × 8 = 168/144 - Likewise, for the 2nd fraction, since 16 × 9 = 144,
4/16 = 4 × 9/16 × 9 = 36/144 - Subtract the two like fractions:
168/144 - 36/144 = 168 - 36/144 = 132/144 - After reducing the fraction, the answer is 11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-4/16 21/18-8/16 21/36-4/16 21/18-4/32 63/18-4/16 21/18-12/16 21/54-4/16 21/18-4/48 21/18-20/16 21/90-4/16 21/18-4/80 21/18-28/16