Subtract 15/21 from 84/45
1st number: 1 39/45, 2nd number: 15/21
84/45 - 15/21 is 121/105.
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,
84/45 = 84 × 7/45 × 7 = 588/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
15/21 = 15 × 15/21 × 15 = 225/315 - Subtract the two like fractions:
588/315 - 225/315 = 588 - 225/315 = 363/315 - After reducing the fraction, the answer is 121/105
- In mixed form: 116/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-30/21 84/90-15/21 84/45-15/42 84/45-45/21 84/45-15/63 84/45-75/21