When you ask "What number is halfway between 4 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=4 and Y=400.
To find the number halfway between 4 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 400 into our formula, we get:
(4 + 400)/2 = 202
Thus, the number halfway between 4 and 400 is 202.
To check that our answer is correct, we subtract 4 from 202 and subtract 202 from 400 and compare the two numbers:
202 - 4 = 198
400 - 202 = 198
As you can see, the halfway number is 198 higher than 4 and 198 lower than 400. Therefore, our halfway between answer of 202 above is correct.
Halfway Between
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Halfway Between 4 and 401
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