Subtract 90/80 from 28/84
1st number: 28/84, 2nd number: 1 10/80
28/84 - 90/80 is -19/24.
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,
28/84 = 28 × 20/84 × 20 = 560/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
90/80 = 90 × 21/80 × 21 = 1890/1680 - Subtract the two like fractions:
560/1680 - 1890/1680 = 560 - 1890/1680 = -1330/1680 - After reducing the fraction, the answer is -19/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/84-90/80