Subtract 90/80 from 6/42
1st number: 6/42, 2nd number: 1 10/80
6/42 - 90/80 is -55/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
6/42 = 6 × 40/42 × 40 = 240/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
90/80 = 90 × 21/80 × 21 = 1890/1680 - Subtract the two like fractions:
240/1680 - 1890/1680 = 240 - 1890/1680 = -1650/1680 - After reducing the fraction, the answer is -55/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/42-90/80 6/84-90/80 18/42-90/80 30/42-90/80