When you ask "What number is halfway between 69 and 878?" 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=878.
To find the number halfway between 69 and 878, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 878 into our formula, we get:
(69 + 878)/2 = 473.5
Thus, the number halfway between 69 and 878 is 473.5.
To check that our answer is correct, we subtract 69 from 473.5 and subtract 473.5 from 878 and compare the two numbers:
473.5 - 69 = 404.5
878 - 473.5 = 404.5
As you can see, the halfway number is 404.5 higher than 69 and 404.5 lower than 878. Therefore, our halfway between answer of 473.5 above is correct.
Halfway Between
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Halfway Between 69 and 879
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