Subtract 7/21 from 45/75
45/75 - 7/21 is 4/15.
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,
7/21 = 7 × 25/21 × 25 = 175/525 - Subtract the two like fractions:
315/525 - 175/525 = 315 - 175/525 = 140/525 - After reducing the fraction, the answer is 4/15
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