When you ask "What number is halfway between 4 and 403?" 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=403.
To find the number halfway between 4 and 403, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 403 into our formula, we get:
(4 + 403)/2 = 203.5
Thus, the number halfway between 4 and 403 is 203.5.
To check that our answer is correct, we subtract 4 from 203.5 and subtract 203.5 from 403 and compare the two numbers:
203.5 - 4 = 199.5
403 - 203.5 = 199.5
As you can see, the halfway number is 199.5 higher than 4 and 199.5 lower than 403. Therefore, our halfway between answer of 203.5 above is correct.
Halfway Between
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Halfway Between 4 and 404
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