Subtract 3/45 from 28/21
1st number: 1 7/21, 2nd number: 3/45
28/21 - 3/45 is 19/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
28/21 = 28 × 15/21 × 15 = 420/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
3/45 = 3 × 7/45 × 7 = 21/315 - Subtract the two like fractions:
420/315 - 21/315 = 420 - 21/315 = 399/315 - After reducing the fraction, the answer is 19/15
- In mixed form: 14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-3/45 28/21-6/45 28/42-3/45 28/21-3/90 84/21-3/45 28/21-9/45 28/63-3/45 28/21-15/45 28/21-21/45