Answers

Subtract 40/14 from 20/21

1^st number: 20/21, 2^nd number: 2 12/14

20/21 - 40/14 is -40/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 14 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 21 × 2 = 42,
   20/21 = 20 × 2/21 × 2 = 40/42
3. Likewise, for the 2nd fraction, since 14 × 3 = 42,
   40/14 = 40 × 3/14 × 3 = 120/42
4. Subtract the two like fractions:
   40/42 - 120/42 = 40 - 120/42 = -80/42
5. After reducing the fraction, the answer is -40/21

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