Subtract 90/80 from 2/42
1st number: 2/42, 2nd number: 1 10/80
2/42 - 90/80 is -181/168.
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,
2/42 = 2 × 40/42 × 40 = 80/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
90/80 = 90 × 21/80 × 21 = 1890/1680 - Subtract the two like fractions:
80/1680 - 1890/1680 = 80 - 1890/1680 = -1810/1680 - After reducing the fraction, the answer is -181/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/42-90/80 2/84-90/80 6/42-90/80 10/42-90/80 14/42-90/80