When you ask "What number is halfway between 7 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=7 and Y=642.
To find the number halfway between 7 and 642, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 642 into our formula, we get:
(7 + 642)/2 = 324.5
Thus, the number halfway between 7 and 642 is 324.5.
To check that our answer is correct, we subtract 7 from 324.5 and subtract 324.5 from 642 and compare the two numbers:
324.5 - 7 = 317.5
642 - 324.5 = 317.5
As you can see, the halfway number is 317.5 higher than 7 and 317.5 lower than 642. Therefore, our halfway between answer of 324.5 above is correct.
Halfway Between
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Halfway Between 7 and 643
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