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4, you add 13 and -5 (13 +-5=8) and divide by 2 to find the mid point (8 / 2 = 4).
you should notice that 4 is 9 less than 13 and 9 more than -5, hence the mid point.
4.5
8
The halfway number between 3/4 and 3/5 is 27/40.
5 (positive 5)
It is 6, the number halfway between them.