Subtract 30/75 from 7/21
7/21 - 30/75 is -1/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 75 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
7/21 = 7 × 25/21 × 25 = 175/525 - Likewise, for the 2nd fraction, since 75 × 7 = 525,
30/75 = 30 × 7/75 × 7 = 210/525 - Subtract the two like fractions:
175/525 - 210/525 = 175 - 210/525 = -35/525 - After reducing the fraction, the answer is -1/15
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