Answers

Subtract 56/27 from 72/21

1^st number: 3 9/21, 2^nd number: 2 2/27

72/21 - 56/27 is 256/189.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 27 is 189
   
   Next, find the equivalent fraction of both fractional numbers with denominator 189
2. For the 1st fraction, since 21 × 9 = 189,
   72/21 = 72 × 9/21 × 9 = 648/189
3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
   56/27 = 56 × 7/27 × 7 = 392/189
4. Subtract the two like fractions:
   648/189 - 392/189 = 648 - 392/189 = 256/189
5. In mixed form: 167/189

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