Subtract 1/21 from 8/45
8/45 - 1/21 is 41/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
8/45 = 8 × 7/45 × 7 = 56/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
1/21 = 1 × 15/21 × 15 = 15/315 - Subtract the two like fractions:
56/315 - 15/315 = 56 - 15/315 = 41/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/45-1/21 8/45-2/21 8/90-1/21 8/45-1/42 24/45-1/21 8/45-3/21 8/45-1/63 40/45-1/21 8/45-5/21 56/45-1/21 8/45-7/21