Subtract 42/80 from 3/8
3/8 - 42/80 is -3/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 8 × 10 = 80,
3/8 = 3 × 10/8 × 10 = 30/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
42/80 = 42 × 1/80 × 1 = 42/80 - Subtract the two like fractions:
30/80 - 42/80 = 30 - 42/80 = -12/80 - After reducing the fraction, the answer is -3/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/8-42/80 3/8-84/80 3/16-42/80 9/8-42/80 3/24-42/80 15/8-42/80 3/40-42/80 21/8-42/80 3/56-42/80