When you ask "What number is halfway between 99 and 401?" 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=401.
To find the number halfway between 99 and 401, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 401 into our formula, we get:
(99 + 401)/2 = 250
Thus, the number halfway between 99 and 401 is 250.
To check that our answer is correct, we subtract 99 from 250 and subtract 250 from 401 and compare the two numbers:
250 - 99 = 151
401 - 250 = 151
As you can see, the halfway number is 151 higher than 99 and 151 lower than 401. Therefore, our halfway between answer of 250 above is correct.
Halfway Between
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Halfway Between 99 and 402
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