Subtract 30/21 from 1/45
1st number: 1/45, 2nd number: 1 9/21
1/45 - 30/21 is -443/315.
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,
1/45 = 1 × 7/45 × 7 = 7/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
30/21 = 30 × 15/21 × 15 = 450/315 - Subtract the two like fractions:
7/315 - 450/315 = 7 - 450/315 = -443/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/45-30/21 1/45-60/21 1/90-30/21 1/45-30/42 3/45-30/21 1/45-90/21 1/45-30/63 5/45-30/21 7/45-30/21