When you ask "What number is halfway between 84 and 209?" 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=209.
To find the number halfway between 84 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 209 into our formula, we get:
(84 + 209)/2 = 146.5
Thus, the number halfway between 84 and 209 is 146.5.
To check that our answer is correct, we subtract 84 from 146.5 and subtract 146.5 from 209 and compare the two numbers:
146.5 - 84 = 62.5
209 - 146.5 = 62.5
As you can see, the halfway number is 62.5 higher than 84 and 62.5 lower than 209. Therefore, our halfway between answer of 146.5 above is correct.
Halfway Between
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Halfway Between 84 and 210
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