Answers

Subtract 20/42 from 25/21

1^st number: 1 4/21, 2^nd number: 20/42

25/21 - 20/42 is 5/7.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 42 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 21 × 2 = 42,
   25/21 = 25 × 2/21 × 2 = 50/42
3. Likewise, for the 2nd fraction, since 42 × 1 = 42,
   20/42 = 20 × 1/42 × 1 = 20/42
4. Subtract the two like fractions:
   50/42 - 20/42 = 50 - 20/42 = 30/42
5. After reducing the fraction, the answer is 5/7

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