When you ask "What number is halfway between 15 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=15 and Y=858.
To find the number halfway between 15 and 858, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 858 into our formula, we get:
(15 + 858)/2 = 436.5
Thus, the number halfway between 15 and 858 is 436.5.
To check that our answer is correct, we subtract 15 from 436.5 and subtract 436.5 from 858 and compare the two numbers:
436.5 - 15 = 421.5
858 - 436.5 = 421.5
As you can see, the halfway number is 421.5 higher than 15 and 421.5 lower than 858. Therefore, our halfway between answer of 436.5 above is correct.
Halfway Between
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Halfway Between 15 and 859
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