Subtract 42/10 from 7/80
1st number: 7/80, 2nd number: 4 2/10
7/80 - 42/10 is -329/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 10 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
7/80 = 7 × 1/80 × 1 = 7/80 - Likewise, for the 2nd fraction, since 10 × 8 = 80,
42/10 = 42 × 8/10 × 8 = 336/80 - Subtract the two like fractions:
7/80 - 336/80 = 7 - 336/80 = -329/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/80-42/10 7/80-84/10 7/80-42/20 21/80-42/10 7/80-42/30 35/80-42/10 7/80-42/50 49/80-42/10 7/80-42/70