When you ask "What number is halfway between 91 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=91 and Y=198.
To find the number halfway between 91 and 198, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 198 into our formula, we get:
(91 + 198)/2 = 144.5
Thus, the number halfway between 91 and 198 is 144.5.
To check that our answer is correct, we subtract 91 from 144.5 and subtract 144.5 from 198 and compare the two numbers:
144.5 - 91 = 53.5
198 - 144.5 = 53.5
As you can see, the halfway number is 53.5 higher than 91 and 53.5 lower than 198. Therefore, our halfway between answer of 144.5 above is correct.
Halfway Between
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Halfway Between 91 and 199
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