Answers

Subtract 81/84 from 42/50

42/50 - 81/84 is -87/700.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 50 and 84 is 2100
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2100
2. For the 1st fraction, since 50 × 42 = 2100,
   42/50 = 42 × 42/50 × 42 = 1764/2100
3. Likewise, for the 2nd fraction, since 84 × 25 = 2100,
   81/84 = 81 × 25/84 × 25 = 2025/2100
4. Subtract the two like fractions:
   1764/2100 - 2025/2100 = 1764 - 2025/2100 = -261/2100
5. After reducing the fraction, the answer is -87/700

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