When you ask "What number is halfway between 7 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=7 and Y=878.
To find the number halfway between 7 and 878, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 878 into our formula, we get:
(7 + 878)/2 = 442.5
Thus, the number halfway between 7 and 878 is 442.5.
To check that our answer is correct, we subtract 7 from 442.5 and subtract 442.5 from 878 and compare the two numbers:
442.5 - 7 = 435.5
878 - 442.5 = 435.5
As you can see, the halfway number is 435.5 higher than 7 and 435.5 lower than 878. Therefore, our halfway between answer of 442.5 above is correct.
Halfway Between
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Halfway Between 7 and 879
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