When you ask "What number is halfway between 55 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=55 and Y=646.
To find the number halfway between 55 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 646 into our formula, we get:
(55 + 646)/2 = 350.5
Thus, the number halfway between 55 and 646 is 350.5.
To check that our answer is correct, we subtract 55 from 350.5 and subtract 350.5 from 646 and compare the two numbers:
350.5 - 55 = 295.5
646 - 350.5 = 295.5
As you can see, the halfway number is 295.5 higher than 55 and 295.5 lower than 646. Therefore, our halfway between answer of 350.5 above is correct.
Halfway Between
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Halfway Between 55 and 647
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