When you ask "What number is halfway between 91 and 189?" 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=189.
To find the number halfway between 91 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 189 into our formula, we get:
(91 + 189)/2 = 140
Thus, the number halfway between 91 and 189 is 140.
To check that our answer is correct, we subtract 91 from 140 and subtract 140 from 189 and compare the two numbers:
140 - 91 = 49
189 - 140 = 49
As you can see, the halfway number is 49 higher than 91 and 49 lower than 189. Therefore, our halfway between answer of 140 above is correct.
Halfway Between
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Halfway Between 91 and 190
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