When you ask "What number is halfway between 18 and 507?" 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=507.
To find the number halfway between 18 and 507, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 507 into our formula, we get:
(18 + 507)/2 = 262.5
Thus, the number halfway between 18 and 507 is 262.5.
To check that our answer is correct, we subtract 18 from 262.5 and subtract 262.5 from 507 and compare the two numbers:
262.5 - 18 = 244.5
507 - 262.5 = 244.5
As you can see, the halfway number is 244.5 higher than 18 and 244.5 lower than 507. Therefore, our halfway between answer of 262.5 above is correct.
Halfway Between
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Halfway Between 18 and 508
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