When you ask "What number is halfway between 9 and 64?" 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=64.
To find the number halfway between 9 and 64, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 64 into our formula, we get:
(9 + 64)/2 = 36.5
Thus, the number halfway between 9 and 64 is 36.5.
To check that our answer is correct, we subtract 9 from 36.5 and subtract 36.5 from 64 and compare the two numbers:
36.5 - 9 = 27.5
64 - 36.5 = 27.5
As you can see, the halfway number is 27.5 higher than 9 and 27.5 lower than 64. Therefore, our halfway between answer of 36.5 above is correct.
Halfway Between
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Halfway Between 9 and 65
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