When you ask "What number is halfway between 0 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=0 and Y=400.
To find the number halfway between 0 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 400 into our formula, we get:
(0 + 400)/2 = 200
Thus, the number halfway between 0 and 400 is 200.
To check that our answer is correct, we subtract 0 from 200 and subtract 200 from 400 and compare the two numbers:
200 - 0 = 200
400 - 200 = 200
As you can see, the halfway number is 200 higher than 0 and 200 lower than 400. Therefore, our halfway between answer of 200 above is correct.
Halfway Between
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Halfway Between 0 and 401
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