Answers

Subtract 98/90 from 9/42

1^st number: 9/42, 2^nd number: 1 8/90

9/42 - 98/90 is -551/630.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   9/42 = 9 × 15/42 × 15 = 135/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   98/90 = 98 × 7/90 × 7 = 686/630
4. Subtract the two like fractions:
   135/630 - 686/630 = 135 - 686/630 = -551/630

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