When you ask "What number is halfway between 17 and 864?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=864.
To find the number halfway between 17 and 864, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 864 into our formula, we get:
(17 + 864)/2 = 440.5
Thus, the number halfway between 17 and 864 is 440.5.
To check that our answer is correct, we subtract 17 from 440.5 and subtract 440.5 from 864 and compare the two numbers:
440.5 - 17 = 423.5
864 - 440.5 = 423.5
As you can see, the halfway number is 423.5 higher than 17 and 423.5 lower than 864. Therefore, our halfway between answer of 440.5 above is correct.
Halfway Between
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Halfway Between 17 and 865
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