Subtract 4/42 from 1/80
1/80 - 4/42 is -139/1680.
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,
1/80 = 1 × 21/80 × 21 = 21/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
4/42 = 4 × 40/42 × 40 = 160/1680 - Subtract the two like fractions:
21/1680 - 160/1680 = 21 - 160/1680 = -139/1680
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/80-4/42 1/80-8/42 1/80-4/84 3/80-4/42 1/80-12/42 5/80-4/42 1/80-20/42 7/80-4/42 1/80-28/42