When you ask "What number is halfway between 10 and 645?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=645.
To find the number halfway between 10 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 645 into our formula, we get:
(10 + 645)/2 = 327.5
Thus, the number halfway between 10 and 645 is 327.5.
To check that our answer is correct, we subtract 10 from 327.5 and subtract 327.5 from 645 and compare the two numbers:
327.5 - 10 = 317.5
645 - 327.5 = 317.5
As you can see, the halfway number is 317.5 higher than 10 and 317.5 lower than 645. Therefore, our halfway between answer of 327.5 above is correct.
Halfway Between
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Halfway Between 10 and 646
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