When you ask "What number is halfway between 15 and 850?" 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=850.
To find the number halfway between 15 and 850, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 850 into our formula, we get:
(15 + 850)/2 = 432.5
Thus, the number halfway between 15 and 850 is 432.5.
To check that our answer is correct, we subtract 15 from 432.5 and subtract 432.5 from 850 and compare the two numbers:
432.5 - 15 = 417.5
850 - 432.5 = 417.5
As you can see, the halfway number is 417.5 higher than 15 and 417.5 lower than 850. Therefore, our halfway between answer of 432.5 above is correct.
Halfway Between
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