When you ask "What number is halfway between 9 and 121?" 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=121.
To find the number halfway between 9 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 121 into our formula, we get:
(9 + 121)/2 = 65
Thus, the number halfway between 9 and 121 is 65.
To check that our answer is correct, we subtract 9 from 65 and subtract 65 from 121 and compare the two numbers:
65 - 9 = 56
121 - 65 = 56
As you can see, the halfway number is 56 higher than 9 and 56 lower than 121. Therefore, our halfway between answer of 65 above is correct.
Halfway Between
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Halfway Between 9 and 122
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