When you ask "What number is halfway between 99 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=99 and Y=400.
To find the number halfway between 99 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 400 into our formula, we get:
(99 + 400)/2 = 249.5
Thus, the number halfway between 99 and 400 is 249.5.
To check that our answer is correct, we subtract 99 from 249.5 and subtract 249.5 from 400 and compare the two numbers:
249.5 - 99 = 150.5
400 - 249.5 = 150.5
As you can see, the halfway number is 150.5 higher than 99 and 150.5 lower than 400. Therefore, our halfway between answer of 249.5 above is correct.
Halfway Between
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Halfway Between 99 and 401
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