Answers

Subtract 40/25 from 5/21

1^st number: 5/21, 2^nd number: 1 15/25

5/21 - 40/25 is -143/105.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 25 is 525
   
   Next, find the equivalent fraction of both fractional numbers with denominator 525
2. For the 1st fraction, since 21 × 25 = 525,
   5/21 = 5 × 25/21 × 25 = 125/525
3. Likewise, for the 2nd fraction, since 25 × 21 = 525,
   40/25 = 40 × 21/25 × 21 = 840/525
4. Subtract the two like fractions:
   125/525 - 840/525 = 125 - 840/525 = -715/525
5. After reducing the fraction, the answer is -143/105

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