When you ask "What number is halfway between 23 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=23 and Y=642.
To find the number halfway between 23 and 642, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 642 into our formula, we get:
(23 + 642)/2 = 332.5
Thus, the number halfway between 23 and 642 is 332.5.
To check that our answer is correct, we subtract 23 from 332.5 and subtract 332.5 from 642 and compare the two numbers:
332.5 - 23 = 309.5
642 - 332.5 = 309.5
As you can see, the halfway number is 309.5 higher than 23 and 309.5 lower than 642. Therefore, our halfway between answer of 332.5 above is correct.
Halfway Between
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Halfway Between 23 and 643
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