When you ask "What number is halfway between 9 and 249?" 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=249.
To find the number halfway between 9 and 249, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 249 into our formula, we get:
(9 + 249)/2 = 129
Thus, the number halfway between 9 and 249 is 129.
To check that our answer is correct, we subtract 9 from 129 and subtract 129 from 249 and compare the two numbers:
129 - 9 = 120
249 - 129 = 120
As you can see, the halfway number is 120 higher than 9 and 120 lower than 249. Therefore, our halfway between answer of 129 above is correct.
Halfway Between
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Halfway Between 9 and 250
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