When you ask "What number is halfway between 9 and 102?" 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=102.
To find the number halfway between 9 and 102, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 102 into our formula, we get:
(9 + 102)/2 = 55.5
Thus, the number halfway between 9 and 102 is 55.5.
To check that our answer is correct, we subtract 9 from 55.5 and subtract 55.5 from 102 and compare the two numbers:
55.5 - 9 = 46.5
102 - 55.5 = 46.5
As you can see, the halfway number is 46.5 higher than 9 and 46.5 lower than 102. Therefore, our halfway between answer of 55.5 above is correct.
Halfway Between
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Halfway Between 9 and 103
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