When you ask "What number is halfway between 63 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=63 and Y=642.
To find the number halfway between 63 and 642, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 63 and 642 into our formula, we get:
(63 + 642)/2 = 352.5
Thus, the number halfway between 63 and 642 is 352.5.
To check that our answer is correct, we subtract 63 from 352.5 and subtract 352.5 from 642 and compare the two numbers:
352.5 - 63 = 289.5
642 - 352.5 = 289.5
As you can see, the halfway number is 289.5 higher than 63 and 289.5 lower than 642. Therefore, our halfway between answer of 352.5 above is correct.
Halfway Between
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Halfway Between 63 and 643
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