
When you ask "What number is halfway between 100 and 401?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=401.

To find the number halfway between 100 and 401, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 401 into our formula, we get:
(100 + 401)/2 = 250.5
Thus, the number halfway between 100 and 401 is 250.5.
To check that our answer is correct, we subtract 100 from 250.5 and subtract 250.5 from 401 and compare the two numbers:
250.5 - 100 = 150.5
401 - 250.5 = 150.5
As you can see, the halfway number is 150.5 higher than 100 and 150.5 lower than 401. Therefore, our halfway between answer of 250.5 above is correct.
Halfway Between
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Halfway Between 100 and 402
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