When you ask "What number is halfway between 15 and 646?" 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=646.
To find the number halfway between 15 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 646 into our formula, we get:
(15 + 646)/2 = 330.5
Thus, the number halfway between 15 and 646 is 330.5.
To check that our answer is correct, we subtract 15 from 330.5 and subtract 330.5 from 646 and compare the two numbers:
330.5 - 15 = 315.5
646 - 330.5 = 315.5
As you can see, the halfway number is 315.5 higher than 15 and 315.5 lower than 646. Therefore, our halfway between answer of 330.5 above is correct.
Halfway Between
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Halfway Between 15 and 647
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