Answers

Subtract 96/90 from 21/80

1^st number: 21/80, 2^nd number: 1 6/90

21/80 - 96/90 is -193/240.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 90 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 80 × 9 = 720,
   21/80 = 21 × 9/80 × 9 = 189/720
3. Likewise, for the 2nd fraction, since 90 × 8 = 720,
   96/90 = 96 × 8/90 × 8 = 768/720
4. Subtract the two like fractions:
   189/720 - 768/720 = 189 - 768/720 = -579/720
5. After reducing the fraction, the answer is -193/240

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