When you ask "What number is halfway between 12 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=12 and Y=409.
To find the number halfway between 12 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 409 into our formula, we get:
(12 + 409)/2 = 210.5
Thus, the number halfway between 12 and 409 is 210.5.
To check that our answer is correct, we subtract 12 from 210.5 and subtract 210.5 from 409 and compare the two numbers:
210.5 - 12 = 198.5
409 - 210.5 = 198.5
As you can see, the halfway number is 198.5 higher than 12 and 198.5 lower than 409. Therefore, our halfway between answer of 210.5 above is correct.
Halfway Between
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Halfway Between 12 and 410
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