When you ask "What number is halfway between 4 and 637?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=637.
To find the number halfway between 4 and 637, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 637 into our formula, we get:
(4 + 637)/2 = 320.5
Thus, the number halfway between 4 and 637 is 320.5.
To check that our answer is correct, we subtract 4 from 320.5 and subtract 320.5 from 637 and compare the two numbers:
320.5 - 4 = 316.5
637 - 320.5 = 316.5
As you can see, the halfway number is 316.5 higher than 4 and 316.5 lower than 637. Therefore, our halfway between answer of 320.5 above is correct.
Halfway Between
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Halfway Between 4 and 638
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