Answers

Subtract 48/42 from 21/20

1^st number: 1 1/20, 2^nd number: 1 6/42

21/20 - 48/42 is -13/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 42 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 20 × 21 = 420,
   21/20 = 21 × 21/20 × 21 = 441/420
3. Likewise, for the 2nd fraction, since 42 × 10 = 420,
   48/42 = 48 × 10/42 × 10 = 480/420
4. Subtract the two like fractions:
   441/420 - 480/420 = 441 - 480/420 = -39/420
5. After reducing the fraction, the answer is -13/140

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