When you ask "What number is halfway between 85 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=85 and Y=400.
To find the number halfway between 85 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 400 into our formula, we get:
(85 + 400)/2 = 242.5
Thus, the number halfway between 85 and 400 is 242.5.
To check that our answer is correct, we subtract 85 from 242.5 and subtract 242.5 from 400 and compare the two numbers:
242.5 - 85 = 157.5
400 - 242.5 = 157.5
As you can see, the halfway number is 157.5 higher than 85 and 157.5 lower than 400. Therefore, our halfway between answer of 242.5 above is correct.
Halfway Between
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Halfway Between 85 and 401
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