Subtract 16/21 from 7/8
7/8 - 16/21 is 19/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
7/8 = 7 × 21/8 × 21 = 147/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
16/21 = 16 × 8/21 × 8 = 128/168 - Subtract the two like fractions:
147/168 - 128/168 = 147 - 128/168 = 19/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/8-16/21 7/8-32/21 7/16-16/21 7/8-16/42 21/8-16/21 7/8-48/21 7/24-16/21 7/8-16/63 35/8-16/21 7/8-80/21 7/40-16/21 49/8-16/21 7/56-16/21