Answers

Subtract 21/15 from 25/21

1^st number: 1 4/21, 2^nd number: 1 6/15

25/21 - 21/15 is -22/105.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 15 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 21 × 5 = 105,
   25/21 = 25 × 5/21 × 5 = 125/105
3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
   21/15 = 21 × 7/15 × 7 = 147/105
4. Subtract the two like fractions:
   125/105 - 147/105 = 125 - 147/105 = -22/105

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