Subtract 21/40 from 45/21
1st number: 2 3/21, 2nd number: 21/40
45/21 - 21/40 is 453/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
45/21 = 45 × 40/21 × 40 = 1800/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
21/40 = 21 × 21/40 × 21 = 441/840 - Subtract the two like fractions:
1800/840 - 441/840 = 1800 - 441/840 = 1359/840 - After reducing the fraction, the answer is 453/280
- In mixed form: 1173/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-21/40 45/21-42/40 45/42-21/40 45/21-21/80 45/21-63/40 45/63-21/40