When you ask "What number is halfway between 4 and 409?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=409.
To find the number halfway between 4 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 409 into our formula, we get:
(4 + 409)/2 = 206.5
Thus, the number halfway between 4 and 409 is 206.5.
To check that our answer is correct, we subtract 4 from 206.5 and subtract 206.5 from 409 and compare the two numbers:
206.5 - 4 = 202.5
409 - 206.5 = 202.5
As you can see, the halfway number is 202.5 higher than 4 and 202.5 lower than 409. Therefore, our halfway between answer of 206.5 above is correct.
Halfway Between
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Halfway Between 4 and 410
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