Subtract 45/21 from 45/20
1st number: 2 5/20, 2nd number: 2 3/21
45/20 - 45/21 is 3/28.
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,
45/20 = 45 × 21/20 × 21 = 945/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
45/21 = 45 × 20/21 × 20 = 900/420 - Subtract the two like fractions:
945/420 - 900/420 = 945 - 900/420 = 45/420 - After reducing the fraction, the answer is 3/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20-45/21 45/20-90/21 45/40-45/21 45/20-45/42 45/60-45/21 45/20-45/63