Answers

Subtract 70/90 from 30/21

1^st number: 1 9/21, 2^nd number: 70/90

30/21 - 70/90 is 41/63.

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,
   30/21 = 30 × 30/21 × 30 = 900/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   70/90 = 70 × 7/90 × 7 = 490/630
4. Subtract the two like fractions:
   900/630 - 490/630 = 900 - 490/630 = 410/630
5. After reducing the fraction, the answer is 41/63

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