When you ask "What number is halfway between 69 and 815?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=69 and Y=815.
To find the number halfway between 69 and 815, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 815 into our formula, we get:
(69 + 815)/2 = 442
Thus, the number halfway between 69 and 815 is 442.
To check that our answer is correct, we subtract 69 from 442 and subtract 442 from 815 and compare the two numbers:
442 - 69 = 373
815 - 442 = 373
As you can see, the halfway number is 373 higher than 69 and 373 lower than 815. Therefore, our halfway between answer of 442 above is correct.
Halfway Between
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Halfway Between 69 and 816
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