When you ask "What number is halfway between 9 and 222?" 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=222.
To find the number halfway between 9 and 222, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 222 into our formula, we get:
(9 + 222)/2 = 115.5
Thus, the number halfway between 9 and 222 is 115.5.
To check that our answer is correct, we subtract 9 from 115.5 and subtract 115.5 from 222 and compare the two numbers:
115.5 - 9 = 106.5
222 - 115.5 = 106.5
As you can see, the halfway number is 106.5 higher than 9 and 106.5 lower than 222. Therefore, our halfway between answer of 115.5 above is correct.
Halfway Between
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Halfway Between 9 and 223
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