When you ask "What number is halfway between 84 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=84 and Y=186.
To find the number halfway between 84 and 186, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 186 into our formula, we get:
(84 + 186)/2 = 135
Thus, the number halfway between 84 and 186 is 135.
To check that our answer is correct, we subtract 84 from 135 and subtract 135 from 186 and compare the two numbers:
135 - 84 = 51
186 - 135 = 51
As you can see, the halfway number is 51 higher than 84 and 51 lower than 186. Therefore, our halfway between answer of 135 above is correct.
Halfway Between
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Halfway Between 84 and 187
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