When you ask "What number is halfway between 91 and 218?" 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=218.
To find the number halfway between 91 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 218 into our formula, we get:
(91 + 218)/2 = 154.5
Thus, the number halfway between 91 and 218 is 154.5.
To check that our answer is correct, we subtract 91 from 154.5 and subtract 154.5 from 218 and compare the two numbers:
154.5 - 91 = 63.5
218 - 154.5 = 63.5
As you can see, the halfway number is 63.5 higher than 91 and 63.5 lower than 218. Therefore, our halfway between answer of 154.5 above is correct.
Halfway Between
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Halfway Between 91 and 219
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