Subtract 54/20 from 42/80
1st number: 42/80, 2nd number: 2 14/20
42/80 - 54/20 is -87/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 20 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
42/80 = 42 × 1/80 × 1 = 42/80 - Likewise, for the 2nd fraction, since 20 × 4 = 80,
54/20 = 54 × 4/20 × 4 = 216/80 - Subtract the two like fractions:
42/80 - 216/80 = 42 - 216/80 = -174/80 - After reducing the fraction, the answer is -87/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80-54/20 42/80-54/40 42/80-54/60