Subtract 20/80 from 5/84
5/84 - 20/80 is -4/21.
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,
5/84 = 5 × 20/84 × 20 = 100/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
20/80 = 20 × 21/80 × 21 = 420/1680 - Subtract the two like fractions:
100/1680 - 420/1680 = 100 - 420/1680 = -320/1680 - After reducing the fraction, the answer is -4/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/84-20/80 5/84-40/80 15/84-20/80 5/84-60/80 25/84-20/80 35/84-20/80