When you ask "What number is halfway between 43 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=43 and Y=400.
To find the number halfway between 43 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 43 and 400 into our formula, we get:
(43 + 400)/2 = 221.5
Thus, the number halfway between 43 and 400 is 221.5.
To check that our answer is correct, we subtract 43 from 221.5 and subtract 221.5 from 400 and compare the two numbers:
221.5 - 43 = 178.5
400 - 221.5 = 178.5
As you can see, the halfway number is 178.5 higher than 43 and 178.5 lower than 400. Therefore, our halfway between answer of 221.5 above is correct.
Halfway Between
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Halfway Between 43 and 401
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