When you ask "What number is halfway between 9 and 110?" 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=110.
To find the number halfway between 9 and 110, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 110 into our formula, we get:
(9 + 110)/2 = 59.5
Thus, the number halfway between 9 and 110 is 59.5.
To check that our answer is correct, we subtract 9 from 59.5 and subtract 59.5 from 110 and compare the two numbers:
59.5 - 9 = 50.5
110 - 59.5 = 50.5
As you can see, the halfway number is 50.5 higher than 9 and 50.5 lower than 110. Therefore, our halfway between answer of 59.5 above is correct.
Halfway Between
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Halfway Between 9 and 111
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