When you ask "What number is halfway between 55 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=55 and Y=400.
To find the number halfway between 55 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 400 into our formula, we get:
(55 + 400)/2 = 227.5
Thus, the number halfway between 55 and 400 is 227.5.
To check that our answer is correct, we subtract 55 from 227.5 and subtract 227.5 from 400 and compare the two numbers:
227.5 - 55 = 172.5
400 - 227.5 = 172.5
As you can see, the halfway number is 172.5 higher than 55 and 172.5 lower than 400. Therefore, our halfway between answer of 227.5 above is correct.
Halfway Between
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Halfway Between 55 and 401
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