Subtract 9/84 from 28/80
28/80 - 9/84 is 17/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 84 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
28/80 = 28 × 21/80 × 21 = 588/1680 - Likewise, for the 2nd fraction, since 84 × 20 = 1680,
9/84 = 9 × 20/84 × 20 = 180/1680 - Subtract the two like fractions:
588/1680 - 180/1680 = 588 - 180/1680 = 408/1680 - After reducing the fraction, the answer is 17/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80-9/84 28/80-18/84 84/80-9/84 28/80-27/84 28/80-45/84 28/80-63/84