When you ask "What number is halfway between 24 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=24 and Y=639.
To find the number halfway between 24 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 24 and 639 into our formula, we get:
(24 + 639)/2 = 331.5
Thus, the number halfway between 24 and 639 is 331.5.
To check that our answer is correct, we subtract 24 from 331.5 and subtract 331.5 from 639 and compare the two numbers:
331.5 - 24 = 307.5
639 - 331.5 = 307.5
As you can see, the halfway number is 307.5 higher than 24 and 307.5 lower than 639. Therefore, our halfway between answer of 331.5 above is correct.
Halfway Between
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Halfway Between 24 and 640
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