Subtract 8/45 from 2/21
2/21 - 8/45 is -26/315.
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,
2/21 = 2 × 15/21 × 15 = 30/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
8/45 = 8 × 7/45 × 7 = 56/315 - Subtract the two like fractions:
30/315 - 56/315 = 30 - 56/315 = -26/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-8/45 2/21-16/45 2/42-8/45 2/21-8/90 6/21-8/45 2/21-24/45 2/63-8/45 10/21-8/45 2/21-40/45 14/21-8/45 2/21-56/45