Subtract 8/42 from 2/80
2/80 - 8/42 is -139/840.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
2/80 = 2 × 21/80 × 21 = 42/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
8/42 = 8 × 40/42 × 40 = 320/1680 - Subtract the two like fractions:
42/1680 - 320/1680 = 42 - 320/1680 = -278/1680 - After reducing the fraction, the answer is -139/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/80-8/42 2/80-16/42 2/80-8/84 6/80-8/42 2/80-24/42 10/80-8/42 2/80-40/42 14/80-8/42 2/80-56/42