When you ask "What number is halfway between 11 and 198?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=11 and Y=198.
To find the number halfway between 11 and 198, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 198 into our formula, we get:
(11 + 198)/2 = 104.5
Thus, the number halfway between 11 and 198 is 104.5.
To check that our answer is correct, we subtract 11 from 104.5 and subtract 104.5 from 198 and compare the two numbers:
104.5 - 11 = 93.5
198 - 104.5 = 93.5
As you can see, the halfway number is 93.5 higher than 11 and 93.5 lower than 198. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 11 and 199
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