1. 15:
Let's say your line looked like this
<----------1-*---------2---->
The star represents the point. The point would be nearer to 1 than to 2!
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If you have a number line, and you start at zero then one fourth would go after the zero. Ex: <0 1/4---I----II----III---->
115 = 5 x 23
Since 115 ends in five, it will divide by '5'. Hence '5' is one of the factors. 5)115 = 23 Hence '23' is the other factor. Since '23' is a prime number, there are no other factors for 115 , but 5, and 23. except '1' & 115'.
where do 0.75 go on the number line
115