Answers

Subtract 25/16 from 4/21

1^st number: 4/21, 2^nd number: 1 9/16

4/21 - 25/16 is -461/336.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 16 is 336
   
   Next, find the equivalent fraction of both fractional numbers with denominator 336
2. For the 1st fraction, since 21 × 16 = 336,
   4/21 = 4 × 16/21 × 16 = 64/336
3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
   25/16 = 25 × 21/16 × 21 = 525/336
4. Subtract the two like fractions:
   64/336 - 525/336 = 64 - 525/336 = -461/336

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