When you ask "What number is halfway between 89 and 158?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=89 and Y=158.
To find the number halfway between 89 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 158 into our formula, we get:
(89 + 158)/2 = 123.5
Thus, the number halfway between 89 and 158 is 123.5.
To check that our answer is correct, we subtract 89 from 123.5 and subtract 123.5 from 158 and compare the two numbers:
123.5 - 89 = 34.5
158 - 123.5 = 34.5
As you can see, the halfway number is 34.5 higher than 89 and 34.5 lower than 158. Therefore, our halfway between answer of 123.5 above is correct.
Halfway Between
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Halfway Between 89 and 159
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