Subtract 20/16 from 1/21
1st number: 1/21, 2nd number: 1 4/16
1/21 - 20/16 is -101/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 21 × 16 = 336,
1/21 = 1 × 16/21 × 16 = 16/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
20/16 = 20 × 21/16 × 21 = 420/336 - Subtract the two like fractions:
16/336 - 420/336 = 16 - 420/336 = -404/336 - After reducing the fraction, the answer is -101/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-20/16 1/21-40/16 1/42-20/16 1/21-20/32 3/21-20/16 1/21-60/16 1/63-20/16 1/21-20/48 5/21-20/16 1/21-20/80 7/21-20/16