Subtract 45/21 from 10/12
1st number: 10/12, 2nd number: 2 3/21
10/12 - 45/21 is -55/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
10/12 = 10 × 7/12 × 7 = 70/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
45/21 = 45 × 4/21 × 4 = 180/84 - Subtract the two like fractions:
70/84 - 180/84 = 70 - 180/84 = -110/84 - After reducing the fraction, the answer is -55/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/12-45/21 10/12-90/21 10/24-45/21 10/12-45/42 30/12-45/21 10/36-45/21 10/12-45/63 50/12-45/21 10/60-45/21 70/12-45/21 10/84-45/21