When you ask "What number is halfway between 18 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=18 and Y=646.
To find the number halfway between 18 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 646 into our formula, we get:
(18 + 646)/2 = 332
Thus, the number halfway between 18 and 646 is 332.
To check that our answer is correct, we subtract 18 from 332 and subtract 332 from 646 and compare the two numbers:
332 - 18 = 314
646 - 332 = 314
As you can see, the halfway number is 314 higher than 18 and 314 lower than 646. Therefore, our halfway between answer of 332 above is correct.
Halfway Between
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Halfway Between 18 and 647
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