When you ask "What number is halfway between 73 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=73 and Y=637.
To find the number halfway between 73 and 637, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 73 and 637 into our formula, we get:
(73 + 637)/2 = 355
Thus, the number halfway between 73 and 637 is 355.
To check that our answer is correct, we subtract 73 from 355 and subtract 355 from 637 and compare the two numbers:
355 - 73 = 282
637 - 355 = 282
As you can see, the halfway number is 282 higher than 73 and 282 lower than 637. Therefore, our halfway between answer of 355 above is correct.
Halfway Between
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Halfway Between 73 and 638
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