When you ask "What number is halfway between 3 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=3 and Y=400.
To find the number halfway between 3 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 400 into our formula, we get:
(3 + 400)/2 = 201.5
Thus, the number halfway between 3 and 400 is 201.5.
To check that our answer is correct, we subtract 3 from 201.5 and subtract 201.5 from 400 and compare the two numbers:
201.5 - 3 = 198.5
400 - 201.5 = 198.5
As you can see, the halfway number is 198.5 higher than 3 and 198.5 lower than 400. Therefore, our halfway between answer of 201.5 above is correct.
Halfway Between
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Halfway Between 3 and 401
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