When you ask "What number is halfway between 7 and 646?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=646.
To find the number halfway between 7 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 646 into our formula, we get:
(7 + 646)/2 = 326.5
Thus, the number halfway between 7 and 646 is 326.5.
To check that our answer is correct, we subtract 7 from 326.5 and subtract 326.5 from 646 and compare the two numbers:
326.5 - 7 = 319.5
646 - 326.5 = 319.5
As you can see, the halfway number is 319.5 higher than 7 and 319.5 lower than 646. Therefore, our halfway between answer of 326.5 above is correct.
Halfway Between
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Halfway Between 7 and 647
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