Answers

Subtract 6/8 from 21/84

21/84 - 6/8 is -1/2.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 8 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 84 × 2 = 168,
   21/84 = 21 × 2/84 × 2 = 42/168
3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
   6/8 = 6 × 21/8 × 21 = 126/168
4. Subtract the two like fractions:
   42/168 - 126/168 = 42 - 126/168 = -84/168
5. After reducing the fraction, the answer is -1/2

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