When you ask "What number is halfway between 9 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=9 and Y=400.
To find the number halfway between 9 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 400 into our formula, we get:
(9 + 400)/2 = 204.5
Thus, the number halfway between 9 and 400 is 204.5.
To check that our answer is correct, we subtract 9 from 204.5 and subtract 204.5 from 400 and compare the two numbers:
204.5 - 9 = 195.5
400 - 204.5 = 195.5
As you can see, the halfway number is 195.5 higher than 9 and 195.5 lower than 400. Therefore, our halfway between answer of 204.5 above is correct.
Halfway Between
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Halfway Between 9 and 401
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