When you ask "What number is halfway between 18 and 104?" 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=104.
To find the number halfway between 18 and 104, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 104 into our formula, we get:
(18 + 104)/2 = 61
Thus, the number halfway between 18 and 104 is 61.
To check that our answer is correct, we subtract 18 from 61 and subtract 61 from 104 and compare the two numbers:
61 - 18 = 43
104 - 61 = 43
As you can see, the halfway number is 43 higher than 18 and 43 lower than 104. Therefore, our halfway between answer of 61 above is correct.
Halfway Between
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Halfway Between 18 and 105
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