Answers

Subtract 84/96 from 21/90

21/90 - 84/96 is -77/120.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 96 is 1440
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1440
2. For the 1st fraction, since 90 × 16 = 1440,
   21/90 = 21 × 16/90 × 16 = 336/1440
3. Likewise, for the 2nd fraction, since 96 × 15 = 1440,
   84/96 = 84 × 15/96 × 15 = 1260/1440
4. Subtract the two like fractions:
   336/1440 - 1260/1440 = 336 - 1260/1440 = -924/1440
5. After reducing the fraction, the answer is -77/120

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