When you ask "What number is halfway between 18 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=18 and Y=637.
To find the number halfway between 18 and 637, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 637 into our formula, we get:
(18 + 637)/2 = 327.5
Thus, the number halfway between 18 and 637 is 327.5.
To check that our answer is correct, we subtract 18 from 327.5 and subtract 327.5 from 637 and compare the two numbers:
327.5 - 18 = 309.5
637 - 327.5 = 309.5
As you can see, the halfway number is 309.5 higher than 18 and 309.5 lower than 637. Therefore, our halfway between answer of 327.5 above is correct.
Halfway Between
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Halfway Between 18 and 638
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