Subtract 40/10 from 42/80
1st number: 42/80, 2nd number: 4 0/10
42/80 - 40/10 is -139/40.
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,
42/80 = 42 × 1/80 × 1 = 42/80 - Likewise, for the 2nd fraction, since 10 × 8 = 80,
40/10 = 40 × 8/10 × 8 = 320/80 - Subtract the two like fractions:
42/80 - 320/80 = 42 - 320/80 = -278/80 - After reducing the fraction, the answer is -139/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80-40/10 42/80-80/10 42/80-40/20 42/80-40/30 42/80-40/50 42/80-40/70