Subtract 21/7 from 21/16
1st number: 1 5/16, 2nd number: 3 0/7
21/16 - 21/7 is -27/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 7 is 112
Next, find the equivalent fraction of both fractional numbers with denominator 112 - For the 1st fraction, since 16 × 7 = 112,
21/16 = 21 × 7/16 × 7 = 147/112 - Likewise, for the 2nd fraction, since 7 × 16 = 112,
21/7 = 21 × 16/7 × 16 = 336/112 - Subtract the two like fractions:
147/112 - 336/112 = 147 - 336/112 = -189/112 - After reducing the fraction, the answer is -27/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/16-21/7 21/16-42/7 21/32-21/7 21/16-21/14 63/16-21/7 21/16-63/7 21/48-21/7 21/80-21/7 21/16-21/35 21/16-21/49