Subtract 54/8 from 21/16
1st number: 1 5/16, 2nd number: 6 6/8
21/16 - 54/8 is -87/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 8 is 16
Next, find the equivalent fraction of both fractional numbers with denominator 16 - For the 1st fraction, since 16 × 1 = 16,
21/16 = 21 × 1/16 × 1 = 21/16 - Likewise, for the 2nd fraction, since 8 × 2 = 16,
54/8 = 54 × 2/8 × 2 = 108/16 - Subtract the two like fractions:
21/16 - 108/16 = 21 - 108/16 = -87/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/16-54/8 21/32-54/8 21/16-54/16 63/16-54/8 21/48-54/8 21/16-54/24 21/80-54/8 21/16-54/40 21/16-54/56