Answers

Subtract 81/80 from 4/10

1^st number: 4/10, 2^nd number: 1 1/80

4/10 - 81/80 is -49/80.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 80 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 10 × 8 = 80,
   4/10 = 4 × 8/10 × 8 = 32/80
3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
   81/80 = 81 × 1/80 × 1 = 81/80
4. Subtract the two like fractions:
   32/80 - 81/80 = 32 - 81/80 = -49/80

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