When you ask "What number is halfway between 3 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=3 and Y=409.
To find the number halfway between 3 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 409 into our formula, we get:
(3 + 409)/2 = 206
Thus, the number halfway between 3 and 409 is 206.
To check that our answer is correct, we subtract 3 from 206 and subtract 206 from 409 and compare the two numbers:
206 - 3 = 203
409 - 206 = 203
As you can see, the halfway number is 203 higher than 3 and 203 lower than 409. Therefore, our halfway between answer of 206 above is correct.
Halfway Between
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Halfway Between 3 and 410
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