Subtract 90/80 from 4/84
1st number: 4/84, 2nd number: 1 10/80
4/84 - 90/80 is -181/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,
4/84 = 4 × 20/84 × 20 = 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: 8/84-90/80 12/84-90/80 20/84-90/80 28/84-90/80