When you ask "What number is halfway between 29 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=29 and Y=642.
To find the number halfway between 29 and 642, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 29 and 642 into our formula, we get:
(29 + 642)/2 = 335.5
Thus, the number halfway between 29 and 642 is 335.5.
To check that our answer is correct, we subtract 29 from 335.5 and subtract 335.5 from 642 and compare the two numbers:
335.5 - 29 = 306.5
642 - 335.5 = 306.5
As you can see, the halfway number is 306.5 higher than 29 and 306.5 lower than 642. Therefore, our halfway between answer of 335.5 above is correct.
Halfway Between
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Halfway Between 29 and 643
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