When you ask "What number is halfway between 40 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=40 and Y=209.
To find the number halfway between 40 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 209 into our formula, we get:
(40 + 209)/2 = 124.5
Thus, the number halfway between 40 and 209 is 124.5.
To check that our answer is correct, we subtract 40 from 124.5 and subtract 124.5 from 209 and compare the two numbers:
124.5 - 40 = 84.5
209 - 124.5 = 84.5
As you can see, the halfway number is 84.5 higher than 40 and 84.5 lower than 209. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 40 and 210
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