Answer:
The answers are different because he used the multiplication of the fractions incorrectly.
Explanation:

we know that a whole number 6 can be written as a fractions as:

so the new equation will be:

we know that in division of fractions, we flip the divisor in the equation so that it becomes:

now we can cross multiply and cancel stuff off so it will become:

and now we can multiply denominator and numerator since nothing else can be canceled off:

and 1/8 as a decimal is 0.125
hence the fraction multiplication in the question was incorrect