Subtract 80/20 from 42/16
1st number: 2 10/16, 2nd number: 4 0/20
42/16 - 80/20 is -11/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 20 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 20 × 4 = 80,
80/20 = 80 × 4/20 × 4 = 320/80 - Subtract the two like fractions:
210/80 - 320/80 = 210 - 320/80 = -110/80 - After reducing the fraction, the answer is -11/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/16-80/20 42/32-80/20 42/16-80/40 42/48-80/20 42/16-80/60 42/80-80/20