Performing in calculations,counting in binary and the fibonacci sequence

1) What is the formula used to return a whole number when doing division?
   =a\b (a divided by b) (e.g. 5//2=2)

2) What is the formula used to return the remainder when doing a division? How does it work? Explain with an example.
a%b

3)Why is it important in computing to understand number systems and in particular binary?
It is important to understand number systems because in many jobs, people are expected to use their knowledge of number systems and codes to work.  Binary is important because it is a way to process the data.

4)How does binary work? i.e how do we convert a number from decimal into binary?
The value of any digit always depends on its position in the whole number.  To convert from decimal to binary, or the other way around, you need only look at the figures place in the whole number and add up its value.