When you ask "What number is halfway between 9 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=9 and Y=126.
To find the number halfway between 9 and 126, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 126 into our formula, we get:
(9 + 126)/2 = 67.5
Thus, the number halfway between 9 and 126 is 67.5.
To check that our answer is correct, we subtract 9 from 67.5 and subtract 67.5 from 126 and compare the two numbers:
67.5 - 9 = 58.5
126 - 67.5 = 58.5
As you can see, the halfway number is 58.5 higher than 9 and 58.5 lower than 126. Therefore, our halfway between answer of 67.5 above is correct.
Halfway Between
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Halfway Between 9 and 127
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