Answers

Subtract 81/28 from 42/36

1^st number: 1 6/36, 2^nd number: 2 25/28

42/36 - 81/28 is -145/84.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 28 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 36 × 7 = 252,
   42/36 = 42 × 7/36 × 7 = 294/252
3. Likewise, for the 2nd fraction, since 28 × 9 = 252,
   81/28 = 81 × 9/28 × 9 = 729/252
4. Subtract the two like fractions:
   294/252 - 729/252 = 294 - 729/252 = -435/252
5. After reducing the fraction, the answer is -145/84

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