When you ask "What number is halfway between 18 and 126?" 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=126.
To find the number halfway between 18 and 126, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 126 into our formula, we get:
(18 + 126)/2 = 72
Thus, the number halfway between 18 and 126 is 72.
To check that our answer is correct, we subtract 18 from 72 and subtract 72 from 126 and compare the two numbers:
72 - 18 = 54
126 - 72 = 54
As you can see, the halfway number is 54 higher than 18 and 54 lower than 126. Therefore, our halfway between answer of 72 above is correct.
Halfway Between
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Halfway Between 18 and 127
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