Answers

Subtract 20/70 from 21/75

21/75 - 20/70 is -1/175.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 70 is 1050
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1050
2. For the 1st fraction, since 75 × 14 = 1050,
   21/75 = 21 × 14/75 × 14 = 294/1050
3. Likewise, for the 2nd fraction, since 70 × 15 = 1050,
   20/70 = 20 × 15/70 × 15 = 300/1050
4. Subtract the two like fractions:
   294/1050 - 300/1050 = 294 - 300/1050 = -6/1050
5. After reducing the fraction, the answer is -1/175

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