Answers

Subtract 72/21 from 40/3

1^st number: 13 1/3, 2^nd number: 3 9/21

40/3 - 72/21 is 208/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 3 and 21 is 21
   
   Next, find the equivalent fraction of both fractional numbers with denominator 21
2. For the 1st fraction, since 3 × 7 = 21,
   40/3 = 40 × 7/3 × 7 = 280/21
3. Likewise, for the 2nd fraction, since 21 × 1 = 21,
   72/21 = 72 × 1/21 × 1 = 72/21
4. Subtract the two like fractions:
   280/21 - 72/21 = 280 - 72/21 = 208/21
5. In mixed form: 919/21

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