Answers

Subtract 1/90 from 25/21

1^st number: 1 4/21, 2^nd number: 1/90

25/21 - 1/90 is 743/630.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 21 × 30 = 630,
   25/21 = 25 × 30/21 × 30 = 750/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   1/90 = 1 × 7/90 × 7 = 7/630
4. Subtract the two like fractions:
   750/630 - 7/630 = 750 - 7/630 = 743/630
5. In mixed form: 1113/630

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