When you ask "What number is halfway between 18 and 647?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=647.
To find the number halfway between 18 and 647, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 647 into our formula, we get:
(18 + 647)/2 = 332.5
Thus, the number halfway between 18 and 647 is 332.5.
To check that our answer is correct, we subtract 18 from 332.5 and subtract 332.5 from 647 and compare the two numbers:
332.5 - 18 = 314.5
647 - 332.5 = 314.5
As you can see, the halfway number is 314.5 higher than 18 and 314.5 lower than 647. Therefore, our halfway between answer of 332.5 above is correct.
Halfway Between
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Halfway Between 18 and 648
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