Answers

Subtract 9/40 from 81/5

1^st number: 16 1/5, 2^nd number: 9/40

81/5 - 9/40 is 639/40.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 5 and 40 is 40
   
   Next, find the equivalent fraction of both fractional numbers with denominator 40
2. For the 1st fraction, since 5 × 8 = 40,
   81/5 = 81 × 8/5 × 8 = 648/40
3. Likewise, for the 2nd fraction, since 40 × 1 = 40,
   9/40 = 9 × 1/40 × 1 = 9/40
4. Subtract the two like fractions:
   648/40 - 9/40 = 648 - 9/40 = 639/40
5. In mixed form: 1539/40

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