Answers

Subtract 72/20 from 2/72

1^st number: 2/72, 2^nd number: 3 12/20

2/72 - 72/20 is -643/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 20 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   2/72 = 2 × 5/72 × 5 = 10/360
3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
   72/20 = 72 × 18/20 × 18 = 1296/360
4. Subtract the two like fractions:
   10/360 - 1296/360 = 10 - 1296/360 = -1286/360
5. After reducing the fraction, the answer is -643/180

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