Subtract 9/21 from 10/45
10/45 - 9/21 is -13/63.
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,
9/21 = 9 × 15/21 × 15 = 135/315 - Subtract the two like fractions:
70/315 - 135/315 = 70 - 135/315 = -65/315 - After reducing the fraction, the answer is -13/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/45-9/21 10/45-18/21 10/90-9/21 10/45-9/42 30/45-9/21 10/45-27/21 10/45-9/63 50/45-9/21 10/45-45/21 70/45-9/21 10/45-63/21