Answers

Subtract 54/21 from 2/90

1^st number: 2/90, 2^nd number: 2 12/21

2/90 - 54/21 is -803/315.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 21 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   2/90 = 2 × 7/90 × 7 = 14/630
3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
   54/21 = 54 × 30/21 × 30 = 1620/630
4. Subtract the two like fractions:
   14/630 - 1620/630 = 14 - 1620/630 = -1606/630
5. After reducing the fraction, the answer is -803/315

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