Subtract 45/21 from 5/20
1st number: 5/20, 2nd number: 2 3/21
5/20 - 45/21 is -53/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
45/21 = 45 × 20/21 × 20 = 900/420 - Subtract the two like fractions:
105/420 - 900/420 = 105 - 900/420 = -795/420 - After reducing the fraction, the answer is -53/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-45/21 5/20-90/21 5/40-45/21 5/20-45/42 15/20-45/21 5/60-45/21 5/20-45/63 25/20-45/21 35/20-45/21