When you ask "What number is halfway between 89 and 130?" 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=130.
To find the number halfway between 89 and 130, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 130 into our formula, we get:
(89 + 130)/2 = 109.5
Thus, the number halfway between 89 and 130 is 109.5.
To check that our answer is correct, we subtract 89 from 109.5 and subtract 109.5 from 130 and compare the two numbers:
109.5 - 89 = 20.5
130 - 109.5 = 20.5
As you can see, the halfway number is 20.5 higher than 89 and 20.5 lower than 130. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 89 and 131
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