Subtract 45/80 from 4/21
4/21 - 45/80 is -125/336.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
4/21 = 4 × 80/21 × 80 = 320/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
45/80 = 45 × 21/80 × 21 = 945/1680 - Subtract the two like fractions:
320/1680 - 945/1680 = 320 - 945/1680 = -625/1680 - After reducing the fraction, the answer is -125/336
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-45/80 4/21-90/80 4/42-45/80 12/21-45/80 4/63-45/80 20/21-45/80 28/21-45/80