Subtract 21/80 from 42/16
1st number: 2 10/16, 2nd number: 21/80
42/16 - 21/80 is 189/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 16 × 5 = 80,
42/16 = 42 × 5/16 × 5 = 210/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Subtract the two like fractions:
210/80 - 21/80 = 210 - 21/80 = 189/80 - In mixed form: 229/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/16-21/80 42/16-42/80 42/32-21/80 42/16-63/80 42/48-21/80 42/80-21/80