When you ask "What number is halfway between 9 and 88?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=88.
To find the number halfway between 9 and 88, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 88 into our formula, we get:
(9 + 88)/2 = 48.5
Thus, the number halfway between 9 and 88 is 48.5.
To check that our answer is correct, we subtract 9 from 48.5 and subtract 48.5 from 88 and compare the two numbers:
48.5 - 9 = 39.5
88 - 48.5 = 39.5
As you can see, the halfway number is 39.5 higher than 9 and 39.5 lower than 88. Therefore, our halfway between answer of 48.5 above is correct.
Halfway Between
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Halfway Between 9 and 89
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