When you ask "What number is halfway between 9 and 191?" 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=191.
To find the number halfway between 9 and 191, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 191 into our formula, we get:
(9 + 191)/2 = 100
Thus, the number halfway between 9 and 191 is 100.
To check that our answer is correct, we subtract 9 from 100 and subtract 100 from 191 and compare the two numbers:
100 - 9 = 91
191 - 100 = 91
As you can see, the halfway number is 91 higher than 9 and 91 lower than 191. Therefore, our halfway between answer of 100 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 9 and 192
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