When you ask "What number is halfway between 68 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=68 and Y=645.
To find the number halfway between 68 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 645 into our formula, we get:
(68 + 645)/2 = 356.5
Thus, the number halfway between 68 and 645 is 356.5.
To check that our answer is correct, we subtract 68 from 356.5 and subtract 356.5 from 645 and compare the two numbers:
356.5 - 68 = 288.5
645 - 356.5 = 288.5
As you can see, the halfway number is 288.5 higher than 68 and 288.5 lower than 645. Therefore, our halfway between answer of 356.5 above is correct.
Halfway Between
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Halfway Between 68 and 646
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