When you ask "What number is halfway between 75 and 638?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=75 and Y=638.
To find the number halfway between 75 and 638, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 638 into our formula, we get:
(75 + 638)/2 = 356.5
Thus, the number halfway between 75 and 638 is 356.5.
To check that our answer is correct, we subtract 75 from 356.5 and subtract 356.5 from 638 and compare the two numbers:
356.5 - 75 = 281.5
638 - 356.5 = 281.5
As you can see, the halfway number is 281.5 higher than 75 and 281.5 lower than 638. Therefore, our halfway between answer of 356.5 above is correct.
Halfway Between
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Halfway Between 75 and 639
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