Answers

Subtract 50/4 from 20/21

1^st number: 20/21, 2^nd number: 12 2/4

20/21 - 50/4 is -485/42.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 4 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   20/21 = 20 × 4/21 × 4 = 80/84
3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
   50/4 = 50 × 21/4 × 21 = 1050/84
4. Subtract the two like fractions:
   80/84 - 1050/84 = 80 - 1050/84 = -970/84
5. After reducing the fraction, the answer is -485/42

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