When you ask "What number is halfway between 70 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=70 and Y=645.
To find the number halfway between 70 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 645 into our formula, we get:
(70 + 645)/2 = 357.5
Thus, the number halfway between 70 and 645 is 357.5.
To check that our answer is correct, we subtract 70 from 357.5 and subtract 357.5 from 645 and compare the two numbers:
357.5 - 70 = 287.5
645 - 357.5 = 287.5
As you can see, the halfway number is 287.5 higher than 70 and 287.5 lower than 645. Therefore, our halfway between answer of 357.5 above is correct.
Halfway Between
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Halfway Between 70 and 646
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