When you ask "What number is halfway between 4 and 989?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=989.
To find the number halfway between 4 and 989, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 989 into our formula, we get:
(4 + 989)/2 = 496.5
Thus, the number halfway between 4 and 989 is 496.5.
To check that our answer is correct, we subtract 4 from 496.5 and subtract 496.5 from 989 and compare the two numbers:
496.5 - 4 = 492.5
989 - 496.5 = 492.5
As you can see, the halfway number is 492.5 higher than 4 and 492.5 lower than 989. Therefore, our halfway between answer of 496.5 above is correct.
Halfway Between
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Halfway Between 4 and 990
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