Answers

Subtract 21/28 from 72/42

1^st number: 1 30/42, 2^nd number: 21/28

72/42 - 21/28 is 27/28.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 28 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 42 × 2 = 84,
   72/42 = 72 × 2/42 × 2 = 144/84
3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
   21/28 = 21 × 3/28 × 3 = 63/84
4. Subtract the two like fractions:
   144/84 - 63/84 = 144 - 63/84 = 81/84
5. After reducing the fraction, the answer is 27/28

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