When you ask "What number is halfway between 71 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=71 and Y=400.
To find the number halfway between 71 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 400 into our formula, we get:
(71 + 400)/2 = 235.5
Thus, the number halfway between 71 and 400 is 235.5.
To check that our answer is correct, we subtract 71 from 235.5 and subtract 235.5 from 400 and compare the two numbers:
235.5 - 71 = 164.5
400 - 235.5 = 164.5
As you can see, the halfway number is 164.5 higher than 71 and 164.5 lower than 400. Therefore, our halfway between answer of 235.5 above is correct.
Halfway Between
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Halfway Between 71 and 401
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