When you ask "What number is halfway between 17 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=17 and Y=646.
To find the number halfway between 17 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 646 into our formula, we get:
(17 + 646)/2 = 331.5
Thus, the number halfway between 17 and 646 is 331.5.
To check that our answer is correct, we subtract 17 from 331.5 and subtract 331.5 from 646 and compare the two numbers:
331.5 - 17 = 314.5
646 - 331.5 = 314.5
As you can see, the halfway number is 314.5 higher than 17 and 314.5 lower than 646. Therefore, our halfway between answer of 331.5 above is correct.
Halfway Between
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Halfway Between 17 and 647
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