When you ask "What number is halfway between 17 and 642?" 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=642.
To find the number halfway between 17 and 642, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 642 into our formula, we get:
(17 + 642)/2 = 329.5
Thus, the number halfway between 17 and 642 is 329.5.
To check that our answer is correct, we subtract 17 from 329.5 and subtract 329.5 from 642 and compare the two numbers:
329.5 - 17 = 312.5
642 - 329.5 = 312.5
As you can see, the halfway number is 312.5 higher than 17 and 312.5 lower than 642. Therefore, our halfway between answer of 329.5 above is correct.
Halfway Between
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Halfway Between 17 and 643
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