Subtract 70/21 from 1/75, Solve 1/75

Subtract 70/21 from 1/75

1^st number: 1/75, 2^nd number: 3 7/21

1/75 - 70/21 is -83/25.

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,
1/75 = 1 × 7/75 × 7 = 7/525
Likewise, for the 2nd fraction, since 21 × 25 = 525,
70/21 = 70 × 25/21 × 25 = 1750/525
Subtract the two like fractions:
7/525 - 1750/525 = 7 - 1750/525 = -1743/525
After reducing the fraction, the answer is -83/25

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