Answers

Subtract 81/24 from 20/84

1^st number: 20/84, 2^nd number: 3 9/24

20/84 - 81/24 is -527/168.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 24 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 84 × 2 = 168,
   20/84 = 20 × 2/84 × 2 = 40/168
3. Likewise, for the 2nd fraction, since 24 × 7 = 168,
   81/24 = 81 × 7/24 × 7 = 567/168
4. Subtract the two like fractions:
   40/168 - 567/168 = 40 - 567/168 = -527/168

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