When you ask "What number is halfway between 18 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=18 and Y=400.
To find the number halfway between 18 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 400 into our formula, we get:
(18 + 400)/2 = 209
Thus, the number halfway between 18 and 400 is 209.
To check that our answer is correct, we subtract 18 from 209 and subtract 209 from 400 and compare the two numbers:
209 - 18 = 191
400 - 209 = 191
As you can see, the halfway number is 191 higher than 18 and 191 lower than 400. Therefore, our halfway between answer of 209 above is correct.
Halfway Between
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Halfway Between 18 and 401
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