When you ask "What number is halfway between 23 and 400?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=23 and Y=400.
To find the number halfway between 23 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 400 into our formula, we get:
(23 + 400)/2 = 211.5
Thus, the number halfway between 23 and 400 is 211.5.
To check that our answer is correct, we subtract 23 from 211.5 and subtract 211.5 from 400 and compare the two numbers:
211.5 - 23 = 188.5
400 - 211.5 = 188.5
As you can see, the halfway number is 188.5 higher than 23 and 188.5 lower than 400. Therefore, our halfway between answer of 211.5 above is correct.
Halfway Between
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Halfway Between 23 and 401
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