When you ask "What number is halfway between 48 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=48 and Y=639.
To find the number halfway between 48 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 48 and 639 into our formula, we get:
(48 + 639)/2 = 343.5
Thus, the number halfway between 48 and 639 is 343.5.
To check that our answer is correct, we subtract 48 from 343.5 and subtract 343.5 from 639 and compare the two numbers:
343.5 - 48 = 295.5
639 - 343.5 = 295.5
As you can see, the halfway number is 295.5 higher than 48 and 295.5 lower than 639. Therefore, our halfway between answer of 343.5 above is correct.
Halfway Between
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Halfway Between 48 and 640
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