When you ask "What number is halfway between 42 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=42 and Y=637.
To find the number halfway between 42 and 637, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 637 into our formula, we get:
(42 + 637)/2 = 339.5
Thus, the number halfway between 42 and 637 is 339.5.
To check that our answer is correct, we subtract 42 from 339.5 and subtract 339.5 from 637 and compare the two numbers:
339.5 - 42 = 297.5
637 - 339.5 = 297.5
As you can see, the halfway number is 297.5 higher than 42 and 297.5 lower than 637. Therefore, our halfway between answer of 339.5 above is correct.
Halfway Between
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Halfway Between 42 and 638
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