
When you ask "What number is halfway between 88 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=88 and Y=409.

To find the number halfway between 88 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 88 and 409 into our formula, we get:
(88 + 409)/2 = 248.5
Thus, the number halfway between 88 and 409 is 248.5.
To check that our answer is correct, we subtract 88 from 248.5 and subtract 248.5 from 409 and compare the two numbers:
248.5 - 88 = 160.5
409 - 248.5 = 160.5
As you can see, the halfway number is 160.5 higher than 88 and 160.5 lower than 409. Therefore, our halfway between answer of 248.5 above is correct.
Halfway Between
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Halfway Between 88 and 410
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