When you ask "What number is halfway between 9 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=9 and Y=642.
To find the number halfway between 9 and 642, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 642 into our formula, we get:
(9 + 642)/2 = 325.5
Thus, the number halfway between 9 and 642 is 325.5.
To check that our answer is correct, we subtract 9 from 325.5 and subtract 325.5 from 642 and compare the two numbers:
325.5 - 9 = 316.5
642 - 325.5 = 316.5
As you can see, the halfway number is 316.5 higher than 9 and 316.5 lower than 642. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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Halfway Between 9 and 643
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