When you ask "What number is halfway between 9 and 186?" 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=186.
To find the number halfway between 9 and 186, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 186 into our formula, we get:
(9 + 186)/2 = 97.5
Thus, the number halfway between 9 and 186 is 97.5.
To check that our answer is correct, we subtract 9 from 97.5 and subtract 97.5 from 186 and compare the two numbers:
97.5 - 9 = 88.5
186 - 97.5 = 88.5
As you can see, the halfway number is 88.5 higher than 9 and 88.5 lower than 186. Therefore, our halfway between answer of 97.5 above is correct.
Halfway Between
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Halfway Between 9 and 187
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