When you ask "What number is halfway between 87 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=87 and Y=878.
To find the number halfway between 87 and 878, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 878 into our formula, we get:
(87 + 878)/2 = 482.5
Thus, the number halfway between 87 and 878 is 482.5.
To check that our answer is correct, we subtract 87 from 482.5 and subtract 482.5 from 878 and compare the two numbers:
482.5 - 87 = 395.5
878 - 482.5 = 395.5
As you can see, the halfway number is 395.5 higher than 87 and 395.5 lower than 878. Therefore, our halfway between answer of 482.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 87 and 879
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