Answers

Subtract 70/21 from 42/75

1^st number: 42/75, 2^nd number: 3 7/21

42/75 - 70/21 is -208/75.

Steps for subtracting fractions

1. 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
2. For the 1st fraction, since 75 × 7 = 525,
   42/75 = 42 × 7/75 × 7 = 294/525
3. Likewise, for the 2nd fraction, since 21 × 25 = 525,
   70/21 = 70 × 25/21 × 25 = 1750/525
4. Subtract the two like fractions:
   294/525 - 1750/525 = 294 - 1750/525 = -1456/525
5. After reducing the fraction, the answer is -208/75

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