Answers

Subtract 72/9 from 10/21

1^st number: 10/21, 2^nd number: 8 0/9

10/21 - 72/9 is -158/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 9 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 21 × 3 = 63,
   10/21 = 10 × 3/21 × 3 = 30/63
3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
   72/9 = 72 × 7/9 × 7 = 504/63
4. Subtract the two like fractions:
   30/63 - 504/63 = 30 - 504/63 = -474/63
5. After reducing the fraction, the answer is -158/21

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