Subtract 40/45 from 50/21
1st number: 2 8/21, 2nd number: 40/45
50/21 - 40/45 is 94/63.
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,
50/21 = 50 × 15/21 × 15 = 750/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
40/45 = 40 × 7/45 × 7 = 280/315 - Subtract the two like fractions:
750/315 - 280/315 = 750 - 280/315 = 470/315 - After reducing the fraction, the answer is 94/63
- In mixed form: 131/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/21-80/45 50/42-40/45 50/21-40/90 50/63-40/45