When you ask "What number is halfway between 9 and 288?" 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=288.
To find the number halfway between 9 and 288, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 288 into our formula, we get:
(9 + 288)/2 = 148.5
Thus, the number halfway between 9 and 288 is 148.5.
To check that our answer is correct, we subtract 9 from 148.5 and subtract 148.5 from 288 and compare the two numbers:
148.5 - 9 = 139.5
288 - 148.5 = 139.5
As you can see, the halfway number is 139.5 higher than 9 and 139.5 lower than 288. Therefore, our halfway between answer of 148.5 above is correct.
Halfway Between
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Halfway Between 9 and 289
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