Subtract 6/21 from 10/45
10/45 - 6/21 is -4/63.
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,
10/45 = 10 × 7/45 × 7 = 70/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
6/21 = 6 × 15/21 × 15 = 90/315 - Subtract the two like fractions:
70/315 - 90/315 = 70 - 90/315 = -20/315 - After reducing the fraction, the answer is -4/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/45-6/21 10/45-12/21 10/90-6/21 10/45-6/42 30/45-6/21 10/45-18/21 10/45-6/63 50/45-6/21 10/45-30/21 70/45-6/21 10/45-42/21