Subtract 49/45 from 40/21
1st number: 1 19/21, 2nd number: 1 4/45
40/21 - 49/45 is 257/315.
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,
40/21 = 40 × 15/21 × 15 = 600/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
49/45 = 49 × 7/45 × 7 = 343/315 - Subtract the two like fractions:
600/315 - 343/315 = 600 - 343/315 = 257/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-49/45 40/21-98/45 40/42-49/45 40/21-49/90 40/63-49/45