When you ask "What number is halfway between 88 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=88 and Y=989.
To find the number halfway between 88 and 989, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 88 and 989 into our formula, we get:
(88 + 989)/2 = 538.5
Thus, the number halfway between 88 and 989 is 538.5.
To check that our answer is correct, we subtract 88 from 538.5 and subtract 538.5 from 989 and compare the two numbers:
538.5 - 88 = 450.5
989 - 538.5 = 450.5
As you can see, the halfway number is 450.5 higher than 88 and 450.5 lower than 989. Therefore, our halfway between answer of 538.5 above is correct.
Halfway Between
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Halfway Between 88 and 990
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