Answers

Subtract 27/20 from 36/42

1^st number: 36/42, 2^nd number: 1 7/20

36/42 - 27/20 is -69/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 42 × 10 = 420,
   36/42 = 36 × 10/42 × 10 = 360/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   27/20 = 27 × 21/20 × 21 = 567/420
4. Subtract the two like fractions:
   360/420 - 567/420 = 360 - 567/420 = -207/420
5. After reducing the fraction, the answer is -69/140

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