When you ask "What number is halfway between 11 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=11 and Y=400.
To find the number halfway between 11 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 400 into our formula, we get:
(11 + 400)/2 = 205.5
Thus, the number halfway between 11 and 400 is 205.5.
To check that our answer is correct, we subtract 11 from 205.5 and subtract 205.5 from 400 and compare the two numbers:
205.5 - 11 = 194.5
400 - 205.5 = 194.5
As you can see, the halfway number is 194.5 higher than 11 and 194.5 lower than 400. Therefore, our halfway between answer of 205.5 above is correct.
Halfway Between
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Halfway Between 11 and 401
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