
When you ask "What number is halfway between 31 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=31 and Y=401.

To find the number halfway between 31 and 401, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 401 into our formula, we get:
(31 + 401)/2 = 216
Thus, the number halfway between 31 and 401 is 216.
To check that our answer is correct, we subtract 31 from 216 and subtract 216 from 401 and compare the two numbers:
216 - 31 = 185
401 - 216 = 185
As you can see, the halfway number is 185 higher than 31 and 185 lower than 401. Therefore, our halfway between answer of 216 above is correct.
Halfway Between
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Halfway Between 31 and 402
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