Subtract 21/28 from 4/16
4/16 - 21/28 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 28 is 112
Next, find the equivalent fraction of both fractional numbers with denominator 112 - For the 1st fraction, since 16 × 7 = 112,
4/16 = 4 × 7/16 × 7 = 28/112 - Likewise, for the 2nd fraction, since 28 × 4 = 112,
21/28 = 21 × 4/28 × 4 = 84/112 - Subtract the two like fractions:
28/112 - 84/112 = 28 - 84/112 = -56/112 - After reducing the fraction, the answer is -1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/16-21/28 4/16-42/28 4/32-21/28 4/16-21/56 12/16-21/28 4/16-63/28 4/48-21/28 4/16-21/84 20/16-21/28 4/80-21/28 28/16-21/28