Answers

Subtract 10/7 from 5/21

1^st number: 5/21, 2^nd number: 1 3/7

5/21 - 10/7 is -25/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 7 is 21
   
   Next, find the equivalent fraction of both fractional numbers with denominator 21
2. For the 1st fraction, since 21 × 1 = 21,
   5/21 = 5 × 1/21 × 1 = 5/21
3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
   10/7 = 10 × 3/7 × 3 = 30/21
4. Subtract the two like fractions:
   5/21 - 30/21 = 5 - 30/21 = -25/21

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