
When you ask "What number is halfway between 16 and 631?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=16 and Y=631.

To find the number halfway between 16 and 631, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 631 into our formula, we get:
(16 + 631)/2 = 323.5
Thus, the number halfway between 16 and 631 is 323.5.
To check that our answer is correct, we subtract 16 from 323.5 and subtract 323.5 from 631 and compare the two numbers:
323.5 - 16 = 307.5
631 - 323.5 = 307.5
As you can see, the halfway number is 307.5 higher than 16 and 307.5 lower than 631. Therefore, our halfway between answer of 323.5 above is correct.
Halfway Between
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Halfway Between 16 and 632
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