if there is a number line and the point is a little of of the number 4, what is now that number?

If the point is slightly off 4, it would depend on which direction the point is shifted from 4. If the point is shifted to the left, it would be slightly less than 4. If the point is shifted to the right, it would be slightly greater than 4.

slightly more than. there is 3 in between 4 and 5 and it is on aftre 4

If the point is slightly more than 4 and there is 3 in between 4 and 5, then the number would be slightly more than 4 but less than 5. We can approximate it to be around 4.3 or 4.4, depending on the degree of "slightness" mentioned.

there are 3 little points btween them and its on the first one

If there are 3 little points between 4 and 5, and the point you are referring to is on the first one, then the number would be slightly more than 4 but less than 4.1. We could approximate it to be around 4.05 or 4.06, depending on the level of "slightness" mentioned.