Answers

Subtract 24/21 from 1/90

1^st number: 1/90, 2^nd number: 1 3/21

1/90 - 24/21 is -713/630.

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,
   1/90 = 1 × 7/90 × 7 = 7/630
3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
   24/21 = 24 × 30/21 × 30 = 720/630
4. Subtract the two like fractions:
   7/630 - 720/630 = 7 - 720/630 = -713/630

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