When you ask "What number is halfway between 17 and 320?" 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=320.
To find the number halfway between 17 and 320, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 320 into our formula, we get:
(17 + 320)/2 = 168.5
Thus, the number halfway between 17 and 320 is 168.5.
To check that our answer is correct, we subtract 17 from 168.5 and subtract 168.5 from 320 and compare the two numbers:
168.5 - 17 = 151.5
320 - 168.5 = 151.5
As you can see, the halfway number is 151.5 higher than 17 and 151.5 lower than 320. Therefore, our halfway between answer of 168.5 above is correct.
Halfway Between
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Halfway Between 17 and 321
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