Answers

Subtract 72/20 from 1/36

1^st number: 1/36, 2^nd number: 3 12/20

1/36 - 72/20 is -643/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 20 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 36 × 5 = 180,
   1/36 = 1 × 5/36 × 5 = 5/180
3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
   72/20 = 72 × 9/20 × 9 = 648/180
4. Subtract the two like fractions:
   5/180 - 648/180 = 5 - 648/180 = -643/180

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