Subtract 20/5 from 21/16
1st number: 1 5/16, 2nd number: 4 0/5
21/16 - 20/5 is -43/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 5 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 16 × 5 = 80,
21/16 = 21 × 5/16 × 5 = 105/80 - Likewise, for the 2nd fraction, since 5 × 16 = 80,
20/5 = 20 × 16/5 × 16 = 320/80 - Subtract the two like fractions:
105/80 - 320/80 = 105 - 320/80 = -215/80 - After reducing the fraction, the answer is -43/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/16-20/5 21/16-40/5 21/32-20/5 21/16-20/10 63/16-20/5 21/16-60/5 21/48-20/5 21/16-20/15 21/80-20/5 21/16-20/25 21/16-20/35