When you ask "What number is halfway between 9 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=9 and Y=320.
To find the number halfway between 9 and 320, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 320 into our formula, we get:
(9 + 320)/2 = 164.5
Thus, the number halfway between 9 and 320 is 164.5.
To check that our answer is correct, we subtract 9 from 164.5 and subtract 164.5 from 320 and compare the two numbers:
164.5 - 9 = 155.5
320 - 164.5 = 155.5
As you can see, the halfway number is 155.5 higher than 9 and 155.5 lower than 320. Therefore, our halfway between answer of 164.5 above is correct.
Halfway Between
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Halfway Between 9 and 321
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