When you ask "What number is halfway between 49 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=49 and Y=638.
To find the number halfway between 49 and 638, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 49 and 638 into our formula, we get:
(49 + 638)/2 = 343.5
Thus, the number halfway between 49 and 638 is 343.5.
To check that our answer is correct, we subtract 49 from 343.5 and subtract 343.5 from 638 and compare the two numbers:
343.5 - 49 = 294.5
638 - 343.5 = 294.5
As you can see, the halfway number is 294.5 higher than 49 and 294.5 lower than 638. Therefore, our halfway between answer of 343.5 above is correct.
Halfway Between
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Halfway Between 49 and 639
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