Subtract 1/21 from 45/75
45/75 - 1/21 is 58/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 75 × 7 = 525,
45/75 = 45 × 7/75 × 7 = 315/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
1/21 = 1 × 25/21 × 25 = 25/525 - Subtract the two like fractions:
315/525 - 25/525 = 315 - 25/525 = 290/525 - After reducing the fraction, the answer is 58/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75-1/21 45/75-2/21 45/75-1/42 45/75-3/21 45/75-1/63 45/75-5/21 45/75-7/21