When you ask "What number is halfway between 18 and 108?" 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=108.
To find the number halfway between 18 and 108, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 108 into our formula, we get:
(18 + 108)/2 = 63
Thus, the number halfway between 18 and 108 is 63.
To check that our answer is correct, we subtract 18 from 63 and subtract 63 from 108 and compare the two numbers:
63 - 18 = 45
108 - 63 = 45
As you can see, the halfway number is 45 higher than 18 and 45 lower than 108. Therefore, our halfway between answer of 63 above is correct.
Halfway Between
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Halfway Between 18 and 109
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