When you ask "What number is halfway between 15 and 644?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=644.
To find the number halfway between 15 and 644, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 644 into our formula, we get:
(15 + 644)/2 = 329.5
Thus, the number halfway between 15 and 644 is 329.5.
To check that our answer is correct, we subtract 15 from 329.5 and subtract 329.5 from 644 and compare the two numbers:
329.5 - 15 = 314.5
644 - 329.5 = 314.5
As you can see, the halfway number is 314.5 higher than 15 and 314.5 lower than 644. Therefore, our halfway between answer of 329.5 above is correct.
Halfway Between
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Halfway Between 15 and 645
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