In order to calculate that, you have to divide 5 from 25
It would be: 25/5 = 5
In short, Your Answer would be 5
Hope this helps!
Yes it is a rational number.
The whole number portion is always the number to the left of the decimal. In this case it is 5. You have to be careful what you say if you are working in scientific notation.
For your second question 0.261 is the decimal portion. If the only part present was 0.261, then 0 is the whole number portion, believe it or not. Nice question. You can learn a lot from it.