When you ask "What number is halfway between 91 and 199?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=91 and Y=199.
To find the number halfway between 91 and 199, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 199 into our formula, we get:
(91 + 199)/2 = 145
Thus, the number halfway between 91 and 199 is 145.
To check that our answer is correct, we subtract 91 from 145 and subtract 145 from 199 and compare the two numbers:
145 - 91 = 54
199 - 145 = 54
As you can see, the halfway number is 54 higher than 91 and 54 lower than 199. Therefore, our halfway between answer of 145 above is correct.
Halfway Between
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Halfway Between 91 and 200
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