Subtract 21/8 from 30/16
1st number: 1 14/16, 2nd number: 2 5/8
30/16 - 21/8 is -3/4.
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,
30/16 = 30 × 1/16 × 1 = 30/16 - Likewise, for the 2nd fraction, since 8 × 2 = 16,
21/8 = 21 × 2/8 × 2 = 42/16 - Subtract the two like fractions:
30/16 - 42/16 = 30 - 42/16 = -12/16 - After reducing the fraction, the answer is -3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/16-21/8 30/16-42/8 30/32-21/8 30/16-21/16 90/16-21/8 30/16-63/8 30/48-21/8 30/16-21/24 30/80-21/8 30/16-21/40 30/16-21/56