Subtract 40/45 from 45/21
1st number: 2 3/21, 2nd number: 40/45
45/21 - 40/45 is 79/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
45/21 = 45 × 15/21 × 15 = 675/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
40/45 = 40 × 7/45 × 7 = 280/315 - Subtract the two like fractions:
675/315 - 280/315 = 675 - 280/315 = 395/315 - After reducing the fraction, the answer is 79/63
- In mixed form: 116/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-40/45 45/21-80/45 45/42-40/45 45/21-40/90 45/63-40/45