When you ask "What number is halfway between 69 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=69 and Y=645.
To find the number halfway between 69 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 645 into our formula, we get:
(69 + 645)/2 = 357
Thus, the number halfway between 69 and 645 is 357.
To check that our answer is correct, we subtract 69 from 357 and subtract 357 from 645 and compare the two numbers:
357 - 69 = 288
645 - 357 = 288
As you can see, the halfway number is 288 higher than 69 and 288 lower than 645. Therefore, our halfway between answer of 357 above is correct.
Halfway Between
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Halfway Between 69 and 646
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