When you ask "What number is halfway between 9 and 86?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=86.
To find the number halfway between 9 and 86, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 86 into our formula, we get:
(9 + 86)/2 = 47.5
Thus, the number halfway between 9 and 86 is 47.5.
To check that our answer is correct, we subtract 9 from 47.5 and subtract 47.5 from 86 and compare the two numbers:
47.5 - 9 = 38.5
86 - 47.5 = 38.5
As you can see, the halfway number is 38.5 higher than 9 and 38.5 lower than 86. Therefore, our halfway between answer of 47.5 above is correct.
Halfway Between
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