When you ask "What number is halfway between 18 and 486?" 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=486.
To find the number halfway between 18 and 486, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 486 into our formula, we get:
(18 + 486)/2 = 252
Thus, the number halfway between 18 and 486 is 252.
To check that our answer is correct, we subtract 18 from 252 and subtract 252 from 486 and compare the two numbers:
252 - 18 = 234
486 - 252 = 234
As you can see, the halfway number is 234 higher than 18 and 234 lower than 486. Therefore, our halfway between answer of 252 above is correct.
Halfway Between
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Halfway Between 18 and 487
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