
When you ask "What number is halfway between 0 and 89?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=0 and Y=89.

To find the number halfway between 0 and 89, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 89 into our formula, we get:
(0 + 89)/2 = 44.5
Thus, the number halfway between 0 and 89 is 44.5.
To check that our answer is correct, we subtract 0 from 44.5 and subtract 44.5 from 89 and compare the two numbers:
44.5 - 0 = 44.5
89 - 44.5 = 44.5
As you can see, the halfway number is 44.5 higher than 0 and 44.5 lower than 89. Therefore, our halfway between answer of 44.5 above is correct.
Halfway Between
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Halfway Between 0 and 90
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