Subtract 20/21 from 20/16
1st number: 1 4/16, 2nd number: 20/21
20/16 - 20/21 is 25/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 21 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 16 × 21 = 336,
20/16 = 20 × 21/16 × 21 = 420/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
20/21 = 20 × 16/21 × 16 = 320/336 - Subtract the two like fractions:
420/336 - 320/336 = 420 - 320/336 = 100/336 - After reducing the fraction, the answer is 25/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/16-20/21 20/16-40/21 20/32-20/21 20/16-20/42 60/16-20/21 20/16-60/21 20/48-20/21 20/16-20/63 20/80-20/21