Subtract 1/8 from 16/21
16/21 - 1/8 is 107/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
16/21 = 16 × 8/21 × 8 = 128/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
1/8 = 1 × 21/8 × 21 = 21/168 - Subtract the two like fractions:
128/168 - 21/168 = 128 - 21/168 = 107/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21-1/8 16/21-2/8 16/42-1/8 16/21-1/16 48/21-1/8 16/21-3/8 16/63-1/8 16/21-1/24 80/21-1/8 16/21-5/8 16/21-1/40 16/21-7/8 16/21-1/56