When you ask "What number is halfway between 86 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=86 and Y=199.
To find the number halfway between 86 and 199, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 199 into our formula, we get:
(86 + 199)/2 = 142.5
Thus, the number halfway between 86 and 199 is 142.5.
To check that our answer is correct, we subtract 86 from 142.5 and subtract 142.5 from 199 and compare the two numbers:
142.5 - 86 = 56.5
199 - 142.5 = 56.5
As you can see, the halfway number is 56.5 higher than 86 and 56.5 lower than 199. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 86 and 200
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