When you ask "What number is halfway between 74 and 639?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=74 and Y=639.
To find the number halfway between 74 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 74 and 639 into our formula, we get:
(74 + 639)/2 = 356.5
Thus, the number halfway between 74 and 639 is 356.5.
To check that our answer is correct, we subtract 74 from 356.5 and subtract 356.5 from 639 and compare the two numbers:
356.5 - 74 = 282.5
639 - 356.5 = 282.5
As you can see, the halfway number is 282.5 higher than 74 and 282.5 lower than 639. Therefore, our halfway between answer of 356.5 above is correct.
Halfway Between
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Halfway Between 74 and 640
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