When you ask "What number is halfway between 9 and 190?" 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=190.
To find the number halfway between 9 and 190, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 190 into our formula, we get:
(9 + 190)/2 = 99.5
Thus, the number halfway between 9 and 190 is 99.5.
To check that our answer is correct, we subtract 9 from 99.5 and subtract 99.5 from 190 and compare the two numbers:
99.5 - 9 = 90.5
190 - 99.5 = 90.5
As you can see, the halfway number is 90.5 higher than 9 and 90.5 lower than 190. Therefore, our halfway between answer of 99.5 above is correct.
Halfway Between
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Halfway Between 9 and 191
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