When you ask "What number is halfway between 55 and 858?" 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=858.
To find the number halfway between 55 and 858, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 858 into our formula, we get:
(55 + 858)/2 = 456.5
Thus, the number halfway between 55 and 858 is 456.5.
To check that our answer is correct, we subtract 55 from 456.5 and subtract 456.5 from 858 and compare the two numbers:
456.5 - 55 = 401.5
858 - 456.5 = 401.5
As you can see, the halfway number is 401.5 higher than 55 and 401.5 lower than 858. Therefore, our halfway between answer of 456.5 above is correct.
Halfway Between
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Halfway Between 55 and 859
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