Subtract 80/5 from 42/4
1st number: 10 2/4, 2nd number: 16 0/5
42/4 - 80/5 is -11/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
42/4 = 42 × 5/4 × 5 = 210/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
80/5 = 80 × 4/5 × 4 = 320/20 - Subtract the two like fractions:
210/20 - 320/20 = 210 - 320/20 = -110/20 - After reducing the fraction, the answer is -11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/4-80/5 42/8-80/5 42/4-80/10 42/12-80/5 42/4-80/15 42/20-80/5 42/4-80/25 42/28-80/5 42/4-80/35