Subtract 18/21 from 3/80
3/80 - 18/21 is -459/560.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
3/80 = 3 × 21/80 × 21 = 63/1680 - Likewise, for the 2nd fraction, since 21 × 80 = 1680,
18/21 = 18 × 80/21 × 80 = 1440/1680 - Subtract the two like fractions:
63/1680 - 1440/1680 = 63 - 1440/1680 = -1377/1680 - After reducing the fraction, the answer is -459/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/80-18/21 3/80-36/21 3/80-18/42 9/80-18/21 3/80-54/21 3/80-18/63 15/80-18/21 3/80-90/21 21/80-18/21